mikeclod
Posts: 270
Joined: Wed Dec 19, 2001 4:03 pm

B737 Main Gear Door Ques

Thu Apr 25, 2002 5:12 pm

I was rereading a manual this week when I noticed an update that requires you to close the "main gear inboard door" before you overwing fuel it. Now I'm 99.9% sure the B-737 does not have an inboard main gear door, what are they talking about? Also, where would it be? Am I crazy or did the writers mess up?
Also, why would you need to do this? It also states you need to do this on the B-727.
Thanks for your help,
Mikeclod
 
JETPILOT
Posts: 3094
Joined: Tue May 18, 1999 6:40 am

RE: B737 Main Gear Door Ques

Thu Apr 25, 2002 5:19 pm

I never heard such a thing. What's your company say who handed out the manual?

JET
 
mikeclod
Posts: 270
Joined: Wed Dec 19, 2001 4:03 pm

RE: B737 Main Gear Door Ques

Thu Apr 25, 2002 5:24 pm

Actually, it was a Delta Fueling manual.
Figure that out........lol
Mikeclod.
 
shaun3000
Posts: 439
Joined: Thu Mar 14, 2002 4:10 pm

RE: B737 Main Gear Door Ques

Fri Apr 26, 2002 7:19 am

Ya got me, unless they are talking about the overwing door, and are using the landing gear as a reference point... but that doesn't make any sence. A) Why not just say overwing door? B) These are emergecy exits, so they wouldn't be open, anyway, during normal operations.
 
JETPILOT
Posts: 3094
Joined: Tue May 18, 1999 6:40 am

RE: B737 Main Gear Door Ques

Fri Apr 26, 2002 7:50 am

The only thing that I could think of is that the gear doors may contact the ground on the 727 as the plane is filled?

But then again I don't think passengers are allowed on board during overwing fueling ops. So the plane wouldn't be that heavy....

Just letting you in on my thought process....

JET
 
L-188
Posts: 29881
Joined: Wed Jul 07, 1999 11:27 am

RE: B737 Main Gear Door Ques

Fri Apr 26, 2002 8:37 am

NO pax is just a military requirement. Fueled plenty of A/C with pax on board....

I haven't a clue what it refers too. Never had to overwing a 737 or 727.
OBAMA-WORST PRESIDENT EVER....Even SKOORB would be better.
 
cdfmxtech
Posts: 1319
Joined: Wed Jul 05, 2000 11:37 am

RE: B737 Main Gear Door Ques

Sat Apr 27, 2002 8:54 pm

What's up bro. In ther last week, you've found a B737 that transfers fuel without the defuel valve open and a B737 with Main Gear Doors.

What airlines are you fueling...lol
 
mikeclod
Posts: 270
Joined: Wed Dec 19, 2001 4:03 pm

RE: B737 Main Gear Door Ques

Sun Apr 28, 2002 6:32 am

The transfer one was on a United, and this one was in a Delta Fueling manual. One of those weeks!
Mikeclod
 
User avatar
HAWK21M
Posts: 29867
Joined: Fri Jan 05, 2001 10:05 pm

RE: B737 Main Gear Door Ques

Mon Apr 29, 2002 2:59 am

The caution prior to opening the Overwing Refueling port on a 737 is to ensure the Wing tanks arn't full by pressure fuelling,as it can cause spillage when the overwing port is opened.
The Door has no relationship to the Overwing port.
regds
HAWK.
I may not win often, but I damn well never lose!!! ;)
 
FltMech9
Posts: 55
Joined: Sun May 27, 2001 10:29 am

RE: B737 Main Gear Door Ques

Mon Apr 29, 2002 9:36 am

I don't know of any B737 with inboard MLG doors. I do know that the DC-9 fueling checklist the military uses, requires the inboard gear doors to be up for all refuels. The doors and hinges can be subject to stress if they are touching the ground during refuels.
 
747Teach
Posts: 176
Joined: Wed Nov 29, 2000 3:05 am

RE: B737 Main Gear Door Ques

Mon Apr 29, 2002 9:23 pm

Mikeclod:
As you may know, very early model 737 aircraft had a "rubber doughnut" that would inflate when the main gear were up and locked to seal the area between the tire and the fairing. After a few instances of the doughnut inflating while the tire was still rotating (which of course pulled the doughnut out of the wheel well), most operators decided the gain in aerodynamics wasn't worth the problems maintaining the doughnut, and removed it. That's the configuration you see today. Around 1980 or 81 I took a close look at a privately owned 737 in Miami which had a full set of main gear doors. They looked exactly like the main gear doors on a 727. That's the only 737 I've ever seen with main gear doors. The doors were open when I looked at it, and it could be possible that a heavy fuel load would put the doors very close to the ground, hence the caution about closing the doors before refueling. Perhaps someday someone will spot that 737 and get a picture. Regards,
 
peterba69
Posts: 147
Joined: Fri Mar 01, 2002 9:31 am

RE: B737 Main Gear Door Ques

Tue Apr 30, 2002 2:43 am

Correct me if I'm wrong, but I seem to remember Boeing replacing those rubber doughnuts with simple brushes that effectively seal the wheelwell and were very maintenance friendly. Personally, I've never seen any 737's w/ mlg doors.
 
shaun3000
Posts: 439
Joined: Thu Mar 14, 2002 4:10 pm

RE: B737 Main Gear Door Ques

Wed May 01, 2002 2:22 pm

Peterba69,

It just so happens I was standing in the main gear wheel well of a Delta 737-400 last Friday (4/26)

In place of the doughnut was a giant O-ring, of sorts. Not brushes. It was cut into sections, each probably 4 inches long. (it is in sections to allow the wheel to pass through. A solid ring of rubber would rip upon the first gear retraction)

On the outer wheel of each main is a large hubcap with a groove on the wheel side. When the gear retract, the rubber pieces fit into the groove on the hubcap, creating a seal. At least that's what I gathered from the Delta mechanic.
 
peterba69
Posts: 147
Joined: Fri Mar 01, 2002 9:31 am

RE: B737 Main Gear Door Ques

Thu May 02, 2002 2:55 am

Cool. It's been about 11 yrs since I got to climb around one of WN's 737's and it was a -200 which had brushes. It also had a "hubcap" on its outboard wheels w/Boeing logo embossed, but no grooves.

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