The Importance of a Pre-Buy Inspection

ByHank Gibson June 28, 2019June 28, 2019

There are multiple ways to save money during the aircraft buying process. To start, since you are buying an airplane, you have some means of positive income in order to afford an airplane. Airplanes come in all different shapes and sizes and usually, an airplane can be found to fit almost any budget, whether is a $20,000 Texas Taildragger all the way up to a multi-million dollar jet.

One way is to stay within your budget. There will always be a shinier, newer, lower time airplane that is just above where you set your budget at. Don’t reach for it! There is a reason you set your budget where you did.

Another way is to shop around and get multiple insurance quotes. Your agent is in charge of engaging underwriters who are going to evaluate you and your airplane as risks, then price a policy accordingly. With most airplanes, you should get multiple quotes to see what fits you best. Beware though, because sometimes, you can get a lower rate, but it will require more training, so you end up shelling out more money in the long run. If you find a policy you like, but the training seems skewed or the liability isn’t high enough, you can always have your agent ask the underwriter to modify the quote. You are still in charge.

Finally, if you evaluate your mission and see that your budget can’t afford an airplane that carries enough or goes fast enough, look into taking on a partner or two to help with costs. Be thorough in vetting your potential partners as a good partnership is worth it’s weight in gold, but a bad one is downright unpleasant and often times hard to get out of. Find pilots who have the same mindset & personality you do and treat their stuff the same way you do. Try to take a ride in their car or go to their house, then you’ll see what kind of shape they will keep the airplane in.

The best way to cost yourself more money in the aircraft buying process?

Don’t do a pre-buy inspection.

A pre-buy inspection takes place after negotiations and once a Purchase Agreement is in place. You are pretty much set on the airplane, you just want a third party mechanic who is knowledgeable on that make and model of airplane (and this is a very important point) to go over it and make sure that it is sound from a mechanical standpoint. The buyer, you, want someone who has never had an association with the seller since the mechanic will be your representative in the process and you want him answering to you.

If you have used a broker or a buyer’s agent, that person should have already gone through the logbooks for you, so you’ll have a basic idea of the history of the airplane. However, knowledgeable mechanics find things all the time that turn out to be the responsibility of the seller to repair since it happened on their watch. Without a pre-buy, you would end up having to pay for that in the not to distant future.

Here is an example of where not doing a pre-buy can cost a lot of money.

An owner bought a late ’70s model Citation ISP, one of the very first Citations ever made. It had been based in Florida (salt & humidity + aircraft don’t mix well) for a while. The buyer didn’t use a broker, but thankfully had someone look through the maintenance history of the airplane. Since it was so old, the logbook reviewer didn’t have time to do anything but a basic overview, but he gave the thumbs up to the buyer.

The buyer decided he just wanted a boroscope inspection and the seller’s mechanics to look over the airplane. Remember what I said before about a third party mechanic? Well, these mechanics didn’t do a very thorough job. When the buyer took delivery of the plane, after about 10 hours of flying, he already had an $18,000-$25,000 maintenance bill.

You may say, well that’s a jet. Jet’s have specialized maintenance and need a more extensive pre-buy inspection.

On the contrary, in my 8 years in the training business, I have seen Cirrus, Piper PA46s, Bonanzas and several other piston engine airplanes that either didn’t have a pre-buy done or the pre-buy was done by someone who didn’t know that airframe. Lo and behold, things started breaking and adding up very quickly that would have been discovered on a good pre-buy inspection.

Don’t skip on the pre-buy inspection. They usually run a few thousand dollars, but save tons of money in the long run.

Recurrent Flight Training
ByHank Gibson August 7, 2014August 7, 2014

As all pilots know, the Federal Aviation Regulations require licensed pilots to go through recurrent flight training in the form of a Flight Review every 24 months. The regulations require 1 hour of ground review and a 1 hour flight. This is all that a pilot has to do to legally maintain his or her VFR currency to fly alone in an airplane. Of course, when passengers are aboard, the pilot has to have done 3 takeoffs and landings in the previous 90 days.

What if the pilot in question hasn’t flown in 20 years? All the regulations require is 1 hour of ground review and a 1 hour flight. Kind of scary, isn’t it? (Any instructor worth his salt would not, however, turn a pilot loose with just those flight review minimums if they haven’t flown in 20 years without an extensive amount of recurrent flight training)

Now, a lot can happen in 2 years in between those flight reviews. Regulations change, airspace is modified, and skills change (for the better or worse, most often for the worse over a period of not flying). For a current pilot who flies once or twice a week, those minimums are no problem. Here’s the thing, though. Even those current pilots typically don’t do a lot of stall practice or emergency procedure practice on their own. These are the most critical areas of flight and to only do them every two years leads to a lot of rust building up, sometimes even causing safety concerns in some instances.

How to remedy this? Scheduling recurrent flight training as often as possible with a good instructor who puts you through your paces. Do this often enough and stalls will become second nature. The stall warning horn goes off? Well, lower the nose and add power. Engine failure? Switch tanks and set best glide. Recurrent flight training allows you to become as familiar as possible with your airplane, allowing you to know what to do in every circumstance.

What’s a good recurrent flight training schedule? There are several options out there. The WINGs program is a pretty good option, though you will only have 3 flight training sessions in those two years instead of 1, but it’s a good start. In recent years, the FAA has put out Advisory Circular 61-98B encouraging pilots to begin personal currency programs for themselves. The suggested schedule for VFR recurrent flight training is every 4-6 weeks.

Texas Top Aviation highly recommends this suggested schedule, for both VFR and IFR. The AC doesn’t have a specific recommendation for IFR recurrent flight training, but flying 2-3 approaches a month with an instructor helps keep pilots as proficient as possible in the IFR environment. This way, the instructor can introduce circumstances in a controlled environment that simulate abnormal conditions that might possibly be encountered in flight. If those abnormal conditions are encountered, then it will be second nature on how to handle them, leading to less accidents and safer flying habits.

Try to schedule your recurrent flight training every 4-6 weeks and your piloting skills will stay top notch, keeping you safe and proficient in every circumstance.
An Educational Runup
ByHank Gibson July 23, 2020July 17, 2020

When a pilot thinks of an engine runup in a single engine piston airplane, typically it is let’s find out if the engine is running rough or not, meaning a spark plug is fouled. Believe it or not, there is a little more to learn from a runup than just checking the spark plugs.

A distinct advantage to having an engine monitor that monitors all EGTs and CHTs is you get a better idea of engine health. When switching to one magneto or the other during the runup, all the EGTs should rise, showing that the temperature of the exhaust gas is going up from each cylinder. This occurs because when running on only one magneto and one set of spark plugs in each cylinder, the mixture takes longer to burn, so, when the exhaust valve in the cylinder opens, the burn is still on going and this hits the EGT probe, causing a temperature rise. An indication of a magneto failure in flight would be a rise in all the cylinders EGT without a change in mixture setting.

Now that we know what to look for when checking each magneto, what would one look for to show that there is a problem? The basic that each student pilot is taught still applies. The engine manufacturer puts a limit on RPM drop during the runup. When checking one magneto or the other, watch for an excessive RPM drop. If the RPM drops past the limit, this usually will be accompanied by engine roughness.

Why is that? Let’s look at the cause for the excessive RPM drop. For this, we need to go back to our EGT indicators. Let’s say we have a 6 cylinder engine. When the key is turned to the right magneto, the RPM drops 250 RPM and the engine gets very rough. Look at the EGT gauge. The cylinders where the spark plugs are firing normally will all show a temperature. The cylinder (or cylinders) where there is no combustion, meaning a bad plug, will show no temperature. This is because the mixture is just sitting in the cylinder and not igniting, therefore, no exhaust gases will be pushed out so there will be no EGT indication for that cylinder. This is also how you tell a mechanic which cylinder to check for the bad plug.

It could also be a bad magneto. If multiple cylinders EGT all drop, or the engine wants to quit entirely, you have a bad magneto or bad ignition harness.

What else can you learn during the runup? Electrical system health is key, especially in all electric airplanes (meaning no vacuum system). It’s a very good idea to turn on all the lights and pitot heat to ensure that a rise is indicated on the ammeter. This means the alternator is carrying the load and working properly.

The next time you do your runup, keep an eye on your EGT to see the rise during a magneto check.
Keeping Your Margin
ByPete Greenwald November 23, 2016December 6, 2016

Just south of the equator in the mountains of Papua, Indonesia on the island of New Guinea, pilots spend their days carrying food, building supplies, doctors, pigs, and passengers into some of the most remote and extreme airstrips on the planet. That’s where I fly.

Each morning I load my Cessna Grand Caravan with 2,600 lbs of (insert strange cargo here) and depart my home base of Wamena just after the sun sends its first rays of light across the waking skies above. I spend my day winding through narrow valleys and crossing high altitude mountain passes with building clouds and poor communication, only to land on short, narrow airstrips with steep slopes and little room for error. Most of these one-way in, one-way out runways require me to commit to landing well before touchdown due to terrain that is too close to allow for a safe go-around. Everything better be right when I cross that decision point or I could be in for some excitement.

The need to keep wide margins of safety might seem obvious in environments like mine, but that doesn’t make them any less important where you fly. You may be a new pilot or an old timer, but keeping your margin should always be on the top of your priority list.

Let’s unpack this further. Margin is not just maintaining the regulatory requirements for cloud clearances or minimum altitudes. It’s more than planning for an alternate airport or carrying the required fuel reserve. Margin is breathing room. It is that extra maneuvering room, the Plan C, the well thought out options that provide you multiple “outs” in any given situation. Margin is what gets you home when things take a turn for the worse.

Margin comes in all shapes and sizes. For myself it includes maintaining double my required turn radius in narrow valleys or choosing not to land when my groundspeed is just 1 knot too high at a short and slippery airstrip. For you, it could be determining a ceiling or visibility minimum requirement that is more conservative than the legal ones or setting a wind limitation that you know is reasonable. When it comes down to it, keeping your margin means you don’t push to the ragged edge of your skill or the aircraft’s capability.

Margin can also refer to your mental or emotional capacity. Are you mentally prepared to divert and miss that important event because the weather is getting bad? Are you ready to handle the disappointment of passengers when you arrive over your airstrip and choose not to land due to approaching rain or a factor that is difficult for a non-pilot to understand? Are you willing to cancel a flight on an important client because you are coming down with a cold or didn’t get adequate sleep? As the PIC of your flying machine, you alone are responsible for the safety of the aircraft and the people on board and those are the tough calls that only you can make.

Fatigue, overconfidence, and complacency are the biggest obstacles to keeping your margin. They are all very subtle dangers and you may be experiencing them without even recognizing it. Fatigue can slow down your thought process leaving you behind the plane and backed into a corner before you know it. Overconfidence might cause you to push weather or commit to a course of action that has no favorable alternatives. Complacency will lead you to believe that, because you have 2000 hours in a particular make and model, you don’t need to do a thorough preflight or complete the pre-landing checklist.

Regardless of experience level, operating environment, fancy avionics, and level of proficiency, margin is something that we all need plenty of. So as you go about your upcoming flights, be asking yourself what you can do to build in more margin. It just might be what gets you home.

Pete Greenwald is a transplant to Atlanta, Georgia who has fallen in love with all things Southern, including his wife, Ashley. As a pilot and A&P with Mission Aviation Fellowship, he flies the Cessna Grand Caravan in Papua, Indonesia serving people who live in isolation. In his spare time he is on the hunt for the best burger around.
Unusual Attitude Recoveries
ByHank Gibson April 10, 2018April 24, 2018

For a VFR or an IFR pilot, an unusual attitude can be one of the most dangerous situations to get into. That is one reason so many new autopilots are being developed with a level button. The concept behind the level button is if the pilot gets into a disorienting situation, press the level button and the autopilot comes on, holding the airplane in a straight and level pitch attitude.

What about all those planes without autopilots that have a level button? That’s who this article is for.

First off, what is an unusual attitude? The Airplane Flying Handbook on page 4-17 gives the following definition: “An unusual attitude is commonly referenced as an unintended or unexpected attitude in instrument flight.” The AFH also goes on to say that an unusual attitude in training has no defined bank and pitch parameters, but “for training purposes an instructor could place the airplane in a 30 degree bank with a nose up pitch attitude of 15 degrees and ask the student to recover and that would be considered an unusual attitude….”

We now have a basis from the FAA. VFR Pilots are now saying, “Oh, instrument flight, that doesn’t apply to us.” Not so fast. The Private Pilot ACS (and before it, the PTS) has a requirement for Basic Attitude Instrument Flying, including unusual attitude recoveries. Why? Because VFR pilots still inadvertently fly into IMC conditions and can get into an unusual attitude. Plus, a private, non-instrument rated pilot has a higher chance of not recovering from an unusual attitude since he isn’t used to relying on his instruments.

At each training event I do, whether it be private pilot training, a flight review, IFR training, transition training, or pretty much any kind of recurrent training, I like to do unusual attitude recoveries with my customers. It’s one of those things that the recovery procedure wanes over time since it isn’t routinely practiced solo (for good reason!).

I see people have the most trouble with the nose high unusual attitude recoveries. Let’s start with the recovery procedure, then I’ll discuss the common errors (notice that the nose high unusual attitude recovery procedure mirrors a stall recovery). Remember, this is in IFR conditions:
- Breathe
- Pitch Down to a level pitch attitude on the Attitude Indicator (or lower if the stall warning horn continues to go off)
- Simultaneously add full power
- Roll wings level
- Flaps up and recover to a level pitch attitude if not there already
The order is important, especially the breathing part. What happens if a pilot goes straight into a recovery and doesn’t pause for a second or two to absorb what’s going on is the recovery isn’t executed properly.

Our brains see the wings banked and set off all kinds of alarms to roll the wings level first before doing anything else. Adding any kind of aileron input with the nose close to the critical angle of attack is a bad idea. You are adding adverse yaw (since you probably won’t be coordinated) and load factor which increases the stall speed. Then we all know that Stall + Yaw = Spin. That’s something that is best avoided in IMC.

We have to teach our brains to ignore the bank angle until the pitch and power come in. Once the airplane is far away from the critical angle of attack, then the bank can be rolled to neutral.

Let’s look at the nose low unusual attitude recovery. The order is still important on this one too:
- Breathe
- Power Reduce (to idle if necessary)
- Roll Wings Level
- Pitch up to a level pitch attitude
- Add Power back to cruise
The theory with the nose low unusual attitude is your speed is accelerating. By reducing the power first, that helps reduce the load factor experienced when the pitch is increased. Same with rolling the wings level. Neutral bank is a lower load factor than some kind of a bank angle. We are trying to prevent overspeeding the airplane. The lower the load factor, the less of a chance we have to rip the wings off.

The most important step in either recovery procedure is to breathe first, allowing the brain to process exactly what is happening. That way, the proper recovery can be executed.
A Proper Cross Country Flight Checklist (Part 1)
ByAndrew Robinson February 8, 2016February 11, 2016

I love cross country flights. Airplanes are designed to travel. When I was instructing private students, my favorite lessons were always the first cross country flights. I looked forward to getting my students out of the pattern, away from the practice area, and showing them what they could really look forward to as a private pilot.

When I was in college, my friend and I borrowed his dad’s Cessna 150, did a cross country flight in it from Indianapolis to Kitty Hawk, then down the coast to Florida. We camped in the grass next to the airplane wherever the airport managers would let us and had our own aviation adventure complete with mechanical problems, unexpected weather, and interesting people along the way. These types of trips have produced some of the best memories and experiences that I’ve acquired during my aviation career so far.

Unfortunately, I know many people whose only cross country flight experience is what was necessary to satisfy their Private and Instrument training requirements. Some of them are nervous about the idea of venturing away from the familiarity of their home airport, while others are relatively new pilots who simply don’t know where to start planning a long cross country flight.

I’ve taken some notes on my preparations for an upcoming cross country flight that I’ll be flying in my dad’s Bonanza. I’m hoping this checklist might help others feel a little more confident that they have everything they need to get going.

Oil

Its always a good idea to bring a few extra quarts of oil. If you stop somewhere and find you need some, its nice to have the right kind on hand. Never assume that the airport you’ll be landing at next will have oil available.

I like to keep a few extra quarts of 15W50 in the back of the Bonanza, just in case (photo from oil-store.com)

Fuel Stops

Here is an example of the 100LL price tool as seen on the Foreflight maps page

I’ve learned the hard way that calling ahead to verify fuel availability can be extremely important. I landed at an airport in Ohio one beautiful Sunday morning to find that the FBO wouldn’t be open until much later in the day. Naturally, there was no other fuel available on the field. I hadn’t called ahead to verify the hours of fuel availability (I assumed they had Self Serve) and had only 2 options: wait a while for the FBO to open, or try and find somewhere else nearby that had gas. As far as price, www.100LL.com is a valuable tool for finding cheap fuel. Foreflight also has posted prices for 100LL and Jet A, but it’s still a good idea to call ahead and verify price and availability.

Batteries for electronics

It’s miserable to run out of batteries for a noise canceling headset with hours remaining in your flight. Bring spares, not only for your headset, but for your flashlight and other gadgets as well. Make sure your hand held GPS, iPad, and Stratus are charged (if you have them). I like to carry a charge cable and adapter as a backup so that I can plug things into the cigarette lighter.

Jumper Cables

We always carry the ground power cable in the back of the Bonanza just in case we ever need a jump. Last month, when I was flying down to Texas, I was glad I had them; we had a dead battery after our fuel stop and had to borrow some power from an FBO worker’s pick up truck. Don’t assume that wherever you are stopping will have the correct cable to jump your airplane, especially if it requires a specific plug.

These are the cables we keep in the back of the Bonanza (photo from airchief.com)

Parking Fees

Every airport is different. I like to call ahead and find out how much the FBO is going to make me pay in landing/overnight fees. When I flew up to Buffalo last summer, I paid 25 dollars for parking at Niagara International (IAG). Had I parked at Buffalo (BUF), they would have charged me over $200.

Approach plates and charts

Make sure you have current approach plates and charts either physically available or downloaded before you blast off. Having a copy of an AFD is a good idea as well, be it digital or paper.

Rental cars

If you arrange it beforehand, many FBO’s will have the car ready for you upon arrival. You may also be able to drop the car off at the FBO when are finished, instead of taking it back to the rental agency. It sure is nice to have the car pulled up next to the airplane when it’s time to unload.

Hotels

Bigger FBO’s may have discounted rates with local hotels. If you call the desk and explain your needs they may offer to book it for you, or at least point you in the right direction. It may be worth picking an airport with more expensive fuel if it puts you closer to the hotels or restaurants you want to go to.

Come back next month for Part 2!

Andrew Robinson is a 135 Charter Pilot and flight instructor who lives with his wife and 2 daughters in Pennsylvania. He flies Pilatus PC-12s and instructs in Beechcraft Bonanzas.
FBO Etiquette
ByAndrew Robinson October 3, 2015

If you’ve ever been to Nantucket Airport during the summer, you’ll understand when I say that it is a crazy place. During the summer months, especially on weekends, the airport is visited by an endless parade of airplanes ranging from the smallest GA airplanes to the biggest private jets.

One sunny Sunday afternoon I was standing in line at the front desk of the Nantucket FBO when the ramp door opened and a very grumpy and entitled man walked in. The man marched right up to the front desk and barked a fuel order at the girl working there, which she mistakenly read back wrong. After yelling at her for her wrongdoing, he announced that he had flown in to go to the restaurant and stormed off to drown his sorrows in fish and chips. Although he was a jerk, his attitude got me thinking about FBO’s and everything that the people who work at them do for us pilots.

For anyone who may not know, FBO stands for Fixed Base Operator. FBO’s can be found at airports everywhere and their business is to provide services such as fuel, hangar space, and tie downs. Bigger FBO’s can offer more services including rental cars, food, maintenance, flight instruction, etc. FBO workers have the ability to make life really good or really miserable for pilots, and, it seems to me, we pilots have the same power over them. Based on my personal experiences and the experiences of some friends who have worked at airports around the country, here are some things to think about next time you taxi onto an FBO ramp.

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I’ve divided this article into two sections:
- FBO Etiquette: What can we as pilots do to make life easier for the workers at the FBOs
- FBO Pilot Perks: Ways that FBOs can help make a pilot’s life better (besides basic services like fueling)
FBO Etiquette

Be Polite

Everyone I talked to about their time working at an FBO said that simply by being friendly and polite is one of the biggest ways we can help. Most of the people that work at the FBOs love aviation and likely are working there to be around the industry in hopes of eventually being more involved. The girl working the desk at Nantucket didn’t deserve to be yelled at just for reading a tail number back wrong; don’t forget that “please” and “thank you” are still magic words.

Call Ahead

Whether you are flying to the airport, or you left your airplane at the FBO and you need them to pull it out or fuel it, calling ahead is greatly appreciated. Most FBO’s have a radio at the front desk and have their frequency listed online and in foreflight. Call ahead and tell them that you’re coming, when you’ll be arriving, and what you’ll need when you get there (gas, rental car, taxi..etc). That way they wont feel rushed and you may get what you’re looking for more expediently upon arrival.

Fuel orders

If your fuel order is difficult or confusing (example: 6.54 gallons in the right side and 4.32 in the left) you may be better off just to do it yourself at the self serve. One of the guys I talked to said that he would have pilots ask for extremely specific numbers and then stand there watching, ready to pounce when it wasn’t fueled exactly right. Its also worth noting that fuelers do make mistakes. Its highly recommended to watch and make sure that the correct truck (Jet A or 100LL) is the one pulling up to dispense your gas. Make sure you check that the fuel caps are properly installed before departing.

Look outside

A lineman motions for the pilot to stop.

Taxiing onto the ramp is not the right time to be doing your after landing and shutdown checklists. Wait until the airplane is stopped before taking your eyes off the person marshaling you to your parking spot. I’ve been told that it isn’t uncommon for a pilot to be looking inside while taxiing and it makes the linemen very nervous as they are motioning to the pilot to stop (For those unfamiliar, with lineman hand signals, here’s a helpful link).

Brakes

Unless you have talked to them and get the okay, don’t leave the parking brake on when leaving your airplane at an FBO. Often the lineman will direct you to park upfront to make loading and unloading easy, but if you’re going to stay for a long period, the airplane will need to be towed and parked out of the way. Leaving the parking brake on can make serious headaches for the people trying to organize the ramp after you leave.

Lights

Don’t blind the poor guy parking you by leaving all your landing, taxi, and recognition lights on as you’re pulling into your spot at night. Likewise, when you are ready to leave your parking space, its courteous to signal the person waiting in front of your airplane by flashing one of your lights at them so they know you are ready to be directed off of the ramp.

FBO Pilot Perks

Good parking

This one is pretty basic. I’ve heard through the grapevine that you may get parked in the boondocks as punishment for being rude to the FBO staff. However, if asked, much of the time they can pull your airplane right up front and may even let you pull a vehicle onto the ramp to load people and bags more easily.

Cheaper hotel rooms/ rental cars

Some FBO’s have special rates with hotel and rental car companies around in the area. Although it varies from place to place, you may be surprised with the amount you can save on these travel essentials. I had a flight last week where I called and was given a quote of 185 dollars for a rental car…after telling them that I was parking at the local FBO, I got the special price of 125. Check with the FBO you will be stopping at for any of their current offerings.

Fuel discounts

Sometimes the price of fuel or the minimum uptake to waive the fees can be negotiated. Sometimes, the fees may be forgotten entirely. If you are unable to take the minimum amount of fuel to waive the landing or ramp charges, tell them what you can take and you may be pleasantly surprised with the response. Its not uncommon with our Bonanza that even though the “minimum” may be 20, I can waive the fees by up-taking 10 or 12 gallons instead.

Points/ Rewards cards

Some FBO’s offer incentives to pilots for buying gas. Many of the rewards programs are free to sign up for and will pay the fuel purchaser cash based on how much fuel they buy over a specified time period. I am a member of the Avtrip program which rewards fuel purchases at Avfuel airports with points that are redeemable for money. Avtrip is just one example of an FBO fuel rewards program; if you fly regularly, it may be worth looking into whether or not there is a fuel rewards program you can take advantage of.

Crew Cars

Most FBO’s have cars designated for use by the pilots. They are extremely nice for going to get lunch or taking care of whatever short errands you may need to run around town. Most crew cars are limited to about 1-2 hours of use, but they can often be loaned out longer based on the discretion of the people working the desk. On a few occasions, I’ve had the cars loaned to me for longer, even over night, by the nice people at the FBO (They always appreciate pilots splashing a few gallons of auto gas into the cars while they are out, too).

FBOs and the services that they provide are invaluable to pilots, both commercial and private. If we as pilots are willing to work with the linemen and service reps we can make both our lives and their lives easier. Remember to be polite and don’t be afraid to ask if you need something….that’s what they’re there for!

Andrew Robinson is a 135 Charter Pilot and flight instructor who lives with his wife and 2 daughters in Pennsylvania. He flies Pilatus PC-12s and instructs in Beechcraft Bonanzas.