Non-Standard Alternate Minimums

When filing an IFR flight plan, part of the process is determining whether or not an alternate airport is required.  An alternate airport is required when the following conditions exist(as is outlined by the FAA in 91.169 (b)):

The weather conditions at the destination airport

  • From 1 hour before your arrival time to 1 hour after your estimated time of arrival, the weather conditions are forecast to be below
  • 2,000 Feet AGL and/or
  • 3 statute miles visibility

Let’s paint a scenario.  You are traveling from KSAT (San Antonio International Airport) to KHBV (Jim Hogg County Airport in Hebbronville, TX).  You start to file your flight plan and get down to the space where you put your alternate in.  Since Laredo (KLRD) is the closest airport with a TAF, you check Laredo’s TAF and see that the forecast conditions there at your ETA are ceilings 1,500 and visibility of 2sm.

Based on this information, you need an alternate airport.  Now, the process of finding one.  In Part 91.169 (c), the forecast conditions at the alternate airport must be at or above:

  • 600 Feet AGL and 2sm visibility for a precision approach, or
  • 800 Feet AGL and 2sm visibility for a non-precision approach

Alright, now we have some guidance.  Laredo is the nearest airport to KHBV, and we know the forecast from the above TAF showing the conditions are forecast to be above the alternate minimums outlined in Part 91, so let’s pick Laredo.  All done?

Not quite.  A lot of airports have Non-Standard Alternate Minimums.  How do you figure out if they do?  The easiest way is to look at any approach plate for the airport.  In the notes section of the government plates, there will be a black triangle with an A in it.  That means there are non-standard alternate minimums published for that airport (in layman’s terms, different than the ones stated above in Part 91).

ILS 17R KLRD

Now the question is, where do you find those non-standard alternate minimums?  On Foreflight:

  • Go to the Airports page
  • Tap the Procedures button
  • Tap the Arrival button
  • Tap the Alternate Minimums option

This brings up the IFR Alternate Minimums document for all the airports with non-standard alternate minimums in that area.  Scroll through to find Laredo.

Non-Standard Alternate Minimums

As you can see, there are several notes there concerning the different approaches into Laredo.  For our example, we’ll say the winds are out of the south and we are planning on flying the ILS 17R if we cannot get into KHBV and have to come to Laredo.  The note there is that the Alternate Minimums for the ILS 17R are actually 700 AGL ceilings and 2sm instead of the above state 600 AGL ceilings and 2sm, the procedure is NA if the tower is closed, and NA if the local weather isn’t received.

What does this tell us?  If the forecasted ceilings at Laredo were below 600 AGL instead of 700 AGL, we would not be able to use LRD as an alternate airport if we were planning on flying the ILS 17R.  The RNAV approaches are all fair game, so a GPS equipped aircraft would have no problem.

On top of that, some approaches at a certain airport are not authorized to be used in the case of the airport being used as an alternate.  At the Galveston airport (KGLS), the ILS 14 is NA as an alternate procedure, but all the RNAV approaches are available.

 

Picking an alternate seems simple at first, but there are actually a lot of things to consider in the process.

Need help remember all this stuff?  AOPA has put out a kneeboard sheet that helps all IFR pilots remember those important things when it comes to IFR flying.  Check it out here.

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    Pictured below on the left is a fuel selector from a Piper Aerostar. The airplane has two selector valves and three fuel tanks. While the system is not difficult to use, it does require proper understanding and regular monitoring to ensure that the fuel is distributed correctly. The picture on the right is the selector out of an A36 Bonanza. I love the simplicity of the Bonanza’s fuel system, but it still takes attention and intention on the part of the pilot to keep track of how much gas is available on either side.

     

    • The JPI unit that we have installed on our airplane even has an “hours and minutes remaining” screen as well as a “fuel required” screen. The totalizer actually talks to the GPS and is able to tell me how much gas I will need to get to my destination. Just remember that those numbers are computed only at the current flow and do not take into account the potential increases/ decreases in consumption which will occur as power settings are changed for descent and arrival into the airport. I may feel pretty good about my hours and minutes remaining when I’m sitting at 12,000 feet, but when center makes me descend to 5,000’ and I’m still an hour away from my destination, endurance will decrease. It also can’t take into account any additional flight time that may be required to shoot approaches, hold, or divert.
    • Have you ever heard of “G.I.G.O?” It stands for “Garbage In, Garbage Out.” What it means is that the information which the fuel totalizer is giving the pilot is only as good as the information that the pilot gave it at the beginning of the flight. The totalizer in our Bonanza does not have any method of checking the quantity in the fuel tanks. At start up the pilot inputs the amount of fuel on board the airplane and the totalizer keeps track of how much is burned which is then subtracted from that inputted number. Ergo, if the amount of fuel is not updated or is incorrect, the fuel total numbers displayed will be inaccurate. If a pilot told the computer that the tanks had been topped off, but didn’t verify it, the fuel could be exhausted and the totalizer would still indicate that there was fuel available. It is, therefore, VERY IMPORTANT to confirm the airplane is fueled to the amount desired (visually if possible) and use the fuel gauges in the airplane to verify the accuracy of the totalizer.
    • Use a timer: I like to use the timer on my phone to remind me when it is time to switch the fuel tanks. If I set the phone to vibrate and put it in my pocket, it will remind me to change tanks at the desired time if I haven’t remembered to otherwise. It’s also nice because I can write down exactly at what time (or quantity) I changed tanks so I can keep very accurate track of how much fuel I have in any given tank. This is especially helpful in airplanes that have more than two fuel tanks. Another option is setting the timer on a Garmin 430, 530, or G1000 to give an alert or message reminding the pilot to change tanks at a preset time.

     

    It shouldn’t come as news to anyone that the importance of fuel planning cannot be overstated. I personally know multiple people who have run airplanes out of fuel because their planning wasn’t quite right or the weather changed and they were unwilling to take the time to stop. In the case of my Bonanza story earlier in this article, it was obvious to me before I even landed that I should have picked a fuel stop when it became apparent that I would arrive at my destination with less than my desired one hour margin.

    The technology that we have now to help us keep track of our fuel usage is wonderful, but use it as an aid; not as your only source of fuel calculation. Remember to verify the amount of fuel on the airplane before you go because the number on the totalizer won’t mean anything if it doesn’t match the amount in the tanks! Above all, don’t be afraid to stop and get fuel when you need it. I’d rather have to tell the passengers that we need to stop for gas than deal with the potential consequences of running out.

    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.

4 Comments

  1. Now the question is, where do you find those non-standard alternate minimums for people *not* using Foreflight?

    1. Hi Theo, in almost all of the EFB apps, it’ll be wherever the arrival and departure info for that airport is stored. If you are looking at a Jepp plate, it’ll be on the airport information plate.

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