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Topic Author
Posts: 423
Joined: Fri May 31, 2002 10:09 am

Nose Gear Door Numbers

Sun Mar 30, 2003 12:49 pm

Before you accuse me of not searching for previous threads, I have searched and found some info regarding this topic. In one thread, someone said that although the reg. may not be on the nose gear doors, the numbers/letters that appear on it can lead you to the registration in the JP Fleet books. I was recently on an American Airlines 757-223 with "5DU" on the nose gear doors (the rego wasn't visible at origin or destination). I do not own the JP fleet books, and I have also checked the jetliner census on for any further info. No luck. If anyone who has one of these books could tell me the registration, I would greatly appreciate it. Also, if anyone knows of any links that could help me, that would be great as well. Thanks very much in advance.  Smile

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RE: Nose Gear Door Numbers

Sun Mar 30, 2003 12:57 pm

5DU Is N601AN if im not mistaken my friend.
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Joined: Thu Apr 05, 2001 4:39 pm

RE: Nose Gear Door Numbers

Sun Mar 30, 2003 8:02 pm

Nosegear door numbers are strange and vary from airline to airline. At Southwest, every single plane of ours has the 3 digits from the tail number painted on the nose gear door. Some airlines have an additional digit added to it. For example, a Northwest tail number is N162US and on the door it says 1162. To this day I haven't figured out American's numbering on their doors. At work, we always joke when we see their 757 come in with 5EX on the door because the 5 looks like an S! Anyways, hope this helps.

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Joined: Sun Jan 28, 2001 12:40 am

RE: Nose Gear Door Numbers

Sun Mar 30, 2003 8:50 pm

Confirming what LOT767-300ER said, fleet number 5DU is indeed N601AN. 757-223 delivered to AA in Feb 1995, s/n 27052 & l/n 661. Source is Bill Harms & Aeromoe websites. Regards.
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RE: Nose Gear Door Numbers

Sun Mar 30, 2003 9:10 pm

Just so you know, China Airlines for example print their whole registration number on the nose door.
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Joined: Thu Mar 15, 2001 3:25 pm

RE: Nose Gear Door Numbers

Sun Mar 30, 2003 9:12 pm

American assigns fleet numbers based on the type (first number) followed by a two-letter code. This gives many more possible combinations than three-digit numbers. However, it is not terribly consistent. It was introduced in the 90's when American was expanding rapidly, and was going to run out of numbers for the fleet. However, it was never used for the MD-80, 727, 767 or DC-10 fleets (the vast majority of AAL's planes), and was introduced part-way into the 757 deliveries. Now, with the integration of TWA a/c, it is being used on all those planes, as well. The MD-11's were "1AA" thru "1AV", the Fokker 100's are all "2__", 737-800's are "3__", 757's "5__" (with exceptions I will list below), & 777's "7__". The 757 fleet began with fleet numbers taken from the registration, starting with "610", up thru "643". However, AA still had some former AirCal 737's in operation, and one of them was fleet # 644, so N644AA became the first under the new system, as "5BP". However, as the letters I, O, Q, and Z are skipped (presumably to avoid confusion with numbers 1, 0, and 2), that leaves 22 fleet numbers per first letter, so "BP" would be the 36th one, but counting from 610 makes 644 the 35th 757 in the fleet. There are other oddities, but I will not try to elucidate them at this time.
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Topic Author
Posts: 423
Joined: Fri May 31, 2002 10:09 am

RE: Nose Gear Door Numbers

Sun Mar 30, 2003 11:55 pm

Thank you all VERY much for all of this helpful info. Thanks again!  Smile

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Joined: Mon Apr 23, 2001 10:12 pm

RE: Nose Gear Door Numbers

Mon Mar 31, 2003 12:34 am

AFAIK KLM derives them from the aircraft construction number, but I'm not 100% certain.
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