Sponsor Message:
Aviation Technical / Operations Forum
My Starred Topics | Profile | New Topic | Forum Index | Help | Search 
Has There Ever Been A Problem With Gear Panels?  
User currently offlineCoolGuy From United States of America, joined Jan 2005, 414 posts, RR: 0
Posted (6 years 9 months 1 week 1 day 16 hours ago) and read 2990 times:

Has there ever been a problem with retracting the landing gear due to the panels that normally extend out to let the gear in. (I doubt that's what they're called, but they're the parts that open up underneath the fuselage only when the gears are extending or retracting.) For example, has a panel ever not deployed and the gear rotated right into the panel, or some other technical problem (excuding problems where the gear simply doesn't move).

24 replies: All unread, jump to last
 
User currently offlineHAWK21M From India, joined Jan 2001, 31679 posts, RR: 56
Reply 1, posted (6 years 9 months 1 week 1 day 12 hours ago) and read 2958 times:

I presume you are reffering to the Landing Gear Doors.
The Sequence valves play the path in ensuring the Doors & Gear Actuators operate in sequence.
regds
MEL



Think of the brighter side!
User currently offlineStarlionblue From Greenland, joined Feb 2004, 17015 posts, RR: 67
Reply 2, posted (6 years 9 months 1 week 1 day 10 hours ago) and read 2942 times:

While the 380 gear was being tested for gravity deployment (before first flight) the wing gear outer wheels got stuck on the gear doors and did thus not descend the whole way. Some grease temporarily solved the problem and there has since been a redesign.


"There are no stupid questions, but there are a lot of inquisitive idiots."
User currently offlineJetlagged From United Kingdom, joined Jan 2005, 2546 posts, RR: 24
Reply 3, posted (6 years 9 months 1 week 1 day 9 hours ago) and read 2929 times:

As MEL said, sequence valves prevent the gear moving before the door is open. If a door fails to open, the gear can be extended by gravity with the hydraulics depressurised and the gear door locks mechanically opened.

If the gear door fails to open for retraction then the gear cannot be retracted.



The glass isn't half empty, or half full, it's twice as big as it needs to be.
User currently offlineAvt007 From Canada, joined Jul 2000, 2132 posts, RR: 5
Reply 4, posted (6 years 9 months 1 week 1 day 7 hours ago) and read 2904 times:

In the very early days of the Dash8, The PSEU (proximity sensors) controlled door sequence. After many problems, including the gear retracting through the doors (which never opened), the system was redesigned.

User currently offlineTdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 80
Reply 5, posted (6 years 9 months 1 week 1 day 5 hours ago) and read 2880 times:



Quoting Jetlagged (Reply 3):

If the gear door fails to open for retraction then the gear cannot be retracted.

It depends why they failed to open. If the sequence valve itself failed (in the right way) then the gear could retract and it would go right through the door, I suspect. The gear is a *lot* stronger than the doors.

Tom.


User currently offlineAvioniker From United States of America, joined Dec 2001, 1109 posts, RR: 11
Reply 6, posted (6 years 9 months 1 week 21 hours ago) and read 2824 times:

There have been a few instances of the center gear on a DC10-30 center gear not retracting because the forward doors were improperly rigged causing them to close before the gear was in the well.
On one KC10 out of C check, in the late 80's, it caused a strut change and cracked the left side gearwell wall and mount.
 Smile



One may educate the ignorance from the unknowing but stupid is forever. Boswell; ca: 1533
User currently offlineArmitageShanks From UK - England, joined Dec 2003, 3619 posts, RR: 15
Reply 7, posted (6 years 9 months 1 week 19 hours ago) and read 2800 times:

Can gear doors be MEL'd? Does that ever happen?

User currently offlineTristarSteve From Sweden, joined Nov 2005, 3999 posts, RR: 34
Reply 8, posted (6 years 9 months 1 week 19 hours ago) and read 2795 times:



Quoting ArmitageShanks (Reply 7):
Can gear doors be MEL'd? Does that ever happen?

Yes but its not MEL its called the CDL, a list of parts that can be missing for flight.
On the A320 for example one MLG door may be missing, or both NLG doors. No pax allowed and fuel increase 5pc.
I once met a Tristar that had flown with a MLG fixed fairing missing. What a mess. The airflow in the bay had ripped out some plugs in the brake system so there was no antiskid working.
It is not something you would dp lightly.


User currently offlinePilotboi From United States of America, joined Sep 2007, 2366 posts, RR: 9
Reply 9, posted (6 years 9 months 1 week 18 hours ago) and read 2787 times:



Quoting ArmitageShanks (Reply 7):
Can gear doors be MEL'd? Does that ever happen?

Our CRJs come in once in a while without MLG doors.


User currently offlineHAWK21M From India, joined Jan 2001, 31679 posts, RR: 56
Reply 10, posted (6 years 9 months 1 week 10 hours ago) and read 2756 times:



Quoting TristarSteve (Reply 8):
On the A320 for example one MLG door may be missing, or both NLG doors. No pax allowed and fuel increase 5pc.

That would be a ferry  Smile
Cheaper to fly in the Doors.Unless the base has no facility.
regds
MEL



Think of the brighter side!
User currently offlineFr8Mech From United States of America, joined Sep 2005, 5390 posts, RR: 14
Reply 11, posted (6 years 9 months 1 week 7 hours ago) and read 2731 times:

Several types allow gear door removal, usually the fixed door, with only speed/weight and/or fuel penalties. No need for ferry flight. This is a CDL item.


When seconds count...the police are minutes away.
User currently offlineHAWK21M From India, joined Jan 2001, 31679 posts, RR: 56
Reply 12, posted (6 years 9 months 1 day 8 hours ago) and read 2586 times:



Quoting Fr8Mech (Reply 11):
Several types allow gear door removal, usually the fixed door, with only speed/weight and/or fuel penalties. No need for ferry flight. This is a CDL item.

Not > 1 door C/f on each Gear under CDL.
regds
MEL



Think of the brighter side!
User currently offlineBR715-A1-30 From , joined Dec 1969, posts, RR:
Reply 13, posted (6 years 8 months 3 weeks 1 day 18 hours ago) and read 2453 times:



Quoting Pilotboi (Reply 9):
Our CRJs come in once in a while without MLG doors.

Nice one Pilotboi.. I frequently see them missing on 737s as well.  duck 


User currently offlineHAWK21M From India, joined Jan 2001, 31679 posts, RR: 56
Reply 14, posted (6 years 8 months 3 weeks 1 day 14 hours ago) and read 2429 times:



Quoting BR715-A1-30 (Reply 13):
Nice one Pilotboi.. I frequently see them missing on 737s as well

The B737s have three Doors on each Main Gear  Smile
regds
MEL



Think of the brighter side!
User currently offlineBoeing767mech From United States of America, joined Dec 2000, 1025 posts, RR: 3
Reply 15, posted (6 years 8 months 3 weeks 1 day 14 hours ago) and read 2429 times:

We had a 757 that had the opposite problem happen, The gear retracted but one of the MLG doors did not close. The airplane flew around with the door hanging out in the airstream. They returned and we replaced the sequence valve.

Also have had problems getting the doors to open on the ground to do maintainence checks. We MEL the maintainence door open side of the sequence valve. Makes it interesting to work in the wheel wells, since you have to pin the gear and select gear up to get the doors to open up.

David



Never under-estimate the predictably of stupidty
User currently offlineVzlet From United States of America, joined Mar 2004, 834 posts, RR: 0
Reply 16, posted (6 years 8 months 3 weeks 1 day 9 hours ago) and read 2401 times:

It took a paper clip to safely resolve this situation:

http://www.labiker.org/xb70/m-Gear_incident.jpg
(Photo from, and more details at http://www.labiker.org/xb70.html)



"That's so stupid! If they're so secret, why are they out where everyone can see them?" - my kid
User currently offlineDH106 From United Kingdom, joined Jun 2005, 626 posts, RR: 1
Reply 17, posted (6 years 8 months 3 weeks 1 day 8 hours ago) and read 2386 times:



Quoting HAWK21M (Reply 1):
I presume you are reffering to the Landing Gear Doors.
The Sequence valves play the path in ensuring the Doors & Gear Actuators operate in sequence

Is that true for every type MEL?

Reason I ask is that I've noted in other threads that several aircraft types (DC-8 springs to mind) seem to start swinging the gear inwards well before the doors are fully open. It seems to me the timing is almost as if both gear and doors seems to start to move about the same time but the legs swing much slower than the doors so the doors achieve full open before the wheels get anywhere close. I admit that this seems quite a precarious situation from an engineering standpoint - it's just what I've observed.

Here's a good example - note both gear and doors are moving: http://www.airliners.net/open.file/1298718/L/[



...I watched c-beams glitter in the dark near the Tanhauser Gate....
User currently offlineHAWK21M From India, joined Jan 2001, 31679 posts, RR: 56
Reply 18, posted (6 years 8 months 3 weeks 1 day 7 hours ago) and read 2380 times:



Quoting DH106 (Reply 17):
Is that true for every type

Im aware of the B752 it def is.
regds
MEL



Think of the brighter side!
User currently offlineEx52tech From United States of America, joined Dec 2006, 559 posts, RR: 1
Reply 19, posted (6 years 8 months 1 week 6 days 7 hours ago) and read 2237 times:

Back in 87, AA Had a 722 come in to DFW with just the nose gear extended, the crew did a great job of greasing it in on the tail skid, and belly. The LH main landing gear door actuator broke internally, and the door would not open hydraulically or manually. I understand that had happened before.

They burned through the belly skins, but not through the cargo compartment floor, and missed the keel beam by about 10". A crew from TUL came down, and had it fixed in about 10days.

There was a dog in the aft cargo.



"Saddest thing I ever witnessed....an airplane being scrapped"
User currently offlineHAWK21M From India, joined Jan 2001, 31679 posts, RR: 56
Reply 20, posted (6 years 7 months 3 weeks 1 day 2 hours ago) and read 2054 times:



Quoting Ex52tech (Reply 19):
They burned through the belly skins, but not through the cargo compartment floor, and missed the keel beam by about 10". A crew from TUL came down, and had it fixed in about 10days

Thats Fast.

Quoting Ex52tech (Reply 19):
There was a dog in the aft cargo

How was the Dogs Reaction when Located?.

regds
MEL



Think of the brighter side!
User currently offline411A From United States of America, joined Nov 2001, 1826 posts, RR: 8
Reply 21, posted (6 years 7 months 3 weeks 14 hours ago) and read 2003 times:

Landing gear doors....sometimes they fall off, inflight.
SVA had one do this over France in the mid-eighties.
The panel concerned was the RH main landing gear fixed door.
This door is fixed to the trunion and moves when the landing gear is extended and retracted.
It fell off, and impacted on a farm, and killed a cow.
The door was retrieved, identified, and SVA was norified....but not before the airplane arrived in JED, and then flew for three more days before anyone noticed it was missing.

An absolutely true story...


User currently offlineHAWK21M From India, joined Jan 2001, 31679 posts, RR: 56
Reply 22, posted (6 years 7 months 3 weeks 13 hours ago) and read 2000 times:



Quoting 411A (Reply 21):
SVA had one do this over France in the mid-eighties

What Type Aircraft.

Quoting 411A (Reply 21):
The door was retrieved, identified, and SVA was norified....but not before the airplane arrived in JED, and then flew for three more days before anyone noticed it was missing.

What about Scheduled Inspections.Even a Transit Check calls for that.
regds
MEL



Think of the brighter side!
User currently offline474218 From United States of America, joined Oct 2005, 6340 posts, RR: 9
Reply 23, posted (6 years 7 months 3 weeks 6 hours ago) and read 1963 times:



Quoting 411A (Reply 21):
Landing gear doors....sometimes they fall off, inflight.
SVA had one do this over France in the mid-eighties.
The panel concerned was the RH main landing gear fixed door.
This door is fixed to the trunion and moves when the landing gear is extended and retracted.
It fell off, and impacted on a farm, and killed a cow.
The door was retrieved, identified, and SVA was norified....but not before the airplane arrived in JED, and then flew for three more days before anyone noticed it was missing.

An absolutely true story...

There were at least six (6) different service bulletins on the L-1011 Fixed Main Landing Gear Door. The way the door sealed to the wing was through the use of a bending beam on the lower end of the door. If the door was rigged to tight the beam attach points would fail and the door would depart the aircraft. If the beam was rigged was rigged to loose the door could flutter and cause it to depart the aircraft.

Quoting HAWK21M (Reply 22):
What Type Aircraft.

See above.


User currently offlineEx52tech From United States of America, joined Dec 2006, 559 posts, RR: 1
Reply 24, posted (6 years 7 months 2 weeks 6 days 8 hours ago) and read 1900 times:



Quoting HAWK21M (Reply 20):
How was the Dogs Reaction when Located?.

I heard that he was ok.



"Saddest thing I ever witnessed....an airplane being scrapped"
Top Of Page
Forum Index

Reply To This Topic Has There Ever Been A Problem With Gear Panels?
Username:
No username? Sign up now!
Password: 


Forgot Password? Be reminded.
Remember me on this computer (uses cookies)
  • Tech/Ops related posts only!
  • Not Tech/Ops related? Use the other forums
  • No adverts of any kind. This includes web pages.
  • No hostile language or criticizing of others.
  • Do not post copyright protected material.
  • Use relevant and describing topics.
  • Check if your post already been discussed.
  • Check your spelling!
  • DETAILED RULES
Add Images Add SmiliesPosting Help

Please check your spelling (press "Check Spelling" above)


Similar topics:More similar topics...
Why There Not More Airliners With Curve Windshield posted Thu Jun 14 2007 05:18:07 by 747400sp
B-70: Was There Ever A Serious Mach 4 Requirement? posted Mon Feb 12 2007 00:51:47 by Starglider
Has Anybody Ever Thought Of This? posted Fri Dec 22 2006 00:07:36 by Blackbird
Are There Brakes On The Nose Gear? posted Tue Jan 24 2006 02:16:47 by Airfoilsguy
Do We Have A Problem With Maitenance posted Thu Dec 22 2005 04:25:12 by Ualflyer
Is There Any Class D Airspace With A Shelf? posted Tue Sep 24 2002 07:26:36 by Shaun3000
Problem With Posts. posted Fri Dec 14 2001 05:28:25 by Avt007
Pilots: Ever Dealt With Inflight Emergen./problem? posted Sat Jul 26 2003 20:29:56 by FSPilot747
737: GEN Fail With Flat Battery Problem posted Sat Aug 5 2006 07:14:40 by Mandala499
380 Landing Gear Problem posted Tue Jul 26 2005 05:18:55 by Venus6971

Sponsor Message:
Printer friendly format