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FedEx 727 Gear Change  
User currently offlineDispatcher From United States of America, joined Jun 1999, 254 posts, RR: 5
Posted (7 years 2 months 1 week 5 days 9 hours ago) and read 3021 times:

Looking at this photo:


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Photo © M.J. Scanlon Photography



What is holding up the front of the jet? I see the two jacks for the mains but it appears the nose jack is setting off to the side. Maybe I'm missing something perspective wise here but it looks to me like the nose is levitating off the ground! The only explanation I can think of would be the tail has been tied to the hangar floor, but that just doesn't sound right either. Thanks in advance.

9 replies: All unread, jump to last
 
User currently offlinePhxplanes From United States of America, joined Feb 2005, 436 posts, RR: 0
Reply 1, posted (7 years 2 months 1 week 5 days 9 hours ago) and read 3015 times:

Wow thats weird I was looking at this photo earlier and didn't even notice.

User currently offlineSfomb67 From United States of America, joined Dec 2005, 417 posts, RR: 0
Reply 2, posted (7 years 2 months 1 week 5 days 8 hours ago) and read 2978 times:

Most Boeing acft, including this 727, are jacked with 2 mains and a tail jack. The nose jack you see off to the side is just for stabilization. This stabilization jack is put in place after the acft is jacked, and removed before dejacking.


Not as easy as originally perceived
User currently offlineEMBQA From United States of America, joined Oct 2003, 9364 posts, RR: 11
Reply 3, posted (7 years 2 months 1 week 5 days 7 hours ago) and read 2965 times:

Quoting Sfomb67 (Reply 2):
Most Boeing acft, including this 727, are jacked with 2 mains and a tail jack.

The Embraer 170/190 is jacked the same way.



"It's not the size of the dog in the fight, but the size of the fight in the dog"
User currently offlineDispatcher From United States of America, joined Jun 1999, 254 posts, RR: 5
Reply 4, posted (7 years 2 months 1 week 5 days 7 hours ago) and read 2954 times:

Wow, thanks Sfomb67, that totally goes against my idea of what makes sense! I didn't believe it until I looked it up in our maintenance manuals. Looks to me like it should fall over on its nose. Thanks for the quick reply and for pointing me in the right direction.

User currently offlineHAWK21M From India, joined Jan 2001, 31684 posts, RR: 56
Reply 5, posted (7 years 2 months 1 week 5 days 1 hour ago) and read 2889 times:

Quoting Sfomb67 (Reply 2):
The nose jack you see off to the side is just for stabilization.

Thats correct.Very similiar to the B737.The nose Fuselage jack is for stablization & placed below the jackpad on the RH side of the Aircraft[ Lh on the Pic].
However I feel the Nose gear jack should have been touching the Nose jack pad & not such a distance away.
regds
MEL



Think of the brighter side!
User currently offlineJetMech From Australia, joined Mar 2006, 2699 posts, RR: 53
Reply 6, posted (7 years 2 months 1 week 4 days 23 hours ago) and read 2862 times:

Quoting Dispatcher (Thread starter):

It seems to be a Boeing tradition. The main jacking points on the 747, 767 and 777 are located under the forward spar of the wing at the root. The C of G is aft of the main jack points and thus, the "tripod" of jacks formed by the main and tail jacks can support the entire aircraft off the ground (weight distribution and limits apply of course).


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Photo © Steve Hall
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Photo © Wenzai



The 747 has five additional stabilisation jack points, one at the nose, and two points along the span of each wing. IIRC, the Airbus arrangement has the two main jack points located on the rear spar, which make a stable triangle with the nose jack. What is amazing with this arrangement is how far away from the root that the main jack points are, as they are located outboard of the main landing gear. The bending moment on the wing must be huge!


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Photo © Piotr Marek (EPGD Spotters)



Regards, JetMech



JetMech split the back of his pants. He can feel the wind in his hair.
User currently offlineSfomb67 From United States of America, joined Dec 2005, 417 posts, RR: 0
Reply 7, posted (7 years 2 months 1 week 4 days 23 hours ago) and read 2854 times:

With the pix of this 727 enlarged, I noticed 2 objects in the back of the nose W/W, that I don't recognize. They look like a pair of 2x6's attached to the belly skin and holding the strut doors closed. Anybody know what these are for?


Not as easy as originally perceived
User currently offlineMiamiair From , joined Dec 1969, posts, RR:
Reply 8, posted (7 years 2 months 1 week 3 days 14 hours ago) and read 2693 times:

Quoting Sfomb67 (Reply 7):
skin and holding the strut doors closed

Those are scoops/ It looks wierd from the perspective in the pic. Here is what they look like:


The strut doors can't be closed if the strut is extended.


User currently offlineSfomb67 From United States of America, joined Dec 2005, 417 posts, RR: 0
Reply 9, posted (7 years 2 months 1 week 3 days 4 hours ago) and read 2602 times:

Are you refering to the curved scoop that would be in detail "C"? It looks like they're on the upper/inside surface of the door. The things I'm refering to, could be scoops, but they look like they're attached to the lower side of the aft strut doors, and it looks like they'd interfere with the closing of the forward doors.


Not as easy as originally perceived
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