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B-727 Trailing Edge 'canoes'  
User currently offlineUAL Bagsmasher From United States of America, joined Sep 1999, 2148 posts, RR: 10
Posted (14 years 2 months 3 weeks 2 days 3 hours ago) and read 1390 times:

I have a question regarding the canoes, I think that's what they are called, on the trailing edge of the B727 wing. They are the somewhat pointy pieces of metal on the underside of the wing. At work yesterday I noticed a B727 being prepared for an outbound flight that was missing one of these pieces. I noticed it a mile away. I asked a mechanic who was working the trip if they were going to dispatch the aircraft with the piece missing. We said yes they were, and it was quite common to fly these planes with one of these parts missing. I'm assumng this is due to lack of spares. He said the resulting drag and is almost nil.
Can any of you A&P's or pilots out there tell me if this is a common practice? If it is, what are the effects of flying with one of the canoe covers missing. Thanks!

9 replies: All unread, jump to last
 
User currently offlineAAR90 From United States of America, joined Jan 2000, 3481 posts, RR: 46
Reply 1, posted (14 years 2 months 3 weeks 2 days 2 hours ago) and read 1236 times:

Their proper name is a "fairing" but more commonly called "canoes" by locals unless dealing with the technical folks (who read manuals rather than turn wrenches).

Most fairings are there for cosmetic as much as aerodynamic reasons and there is usually little weight penalty for flying without one (or more).

My DC9 CDL shows a max takeoff weight penalty of 3,100 lbs and max landing weight penalty of 1,300 lbs if one flap hinge fairing is removed. Closest thing to a canoe that aircraft has.

My old 767 CDL shows multiple weight penalties for different configurations and phase of flight from 1,700 lbs to 3,800 lbs.



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User currently offlineJETPILOT From United States of America, joined May 1999, 3130 posts, RR: 29
Reply 2, posted (14 years 2 months 3 weeks 2 days ago) and read 1223 times:

Boieng calls these flap track fairings.

The CDL AAR90 is refering to is a Configuration Deviation List. It is a list of things that affect the aerodynamic properties of the airframe, and the effects on fuel burn.

The CDL item might also dictate a penalty limiting the MGTOW for the aircraft.

If the item is not contained in the CDL then it is a "No Go" item.


User currently offlineL-188 From United States of America, joined Jul 1999, 29813 posts, RR: 58
Reply 3, posted (14 years 2 months 3 weeks 1 day 22 hours ago) and read 1196 times:

I can comfirm that the 727 can be flown with one of the flap track fairings removed. Usually it is the one on the right side nearest to the fuselage that is missing. This is because it is the one that if most likely to be damaged by careless postioning/operation of baggage handling equiptment accessing the rear door.


OBAMA-WORST PRESIDENT EVER....Even SKOORB would be better.
User currently offlineNKP S2 From United States of America, joined Dec 1999, 1714 posts, RR: 5
Reply 4, posted (14 years 2 months 3 weeks 1 day 17 hours ago) and read 1177 times:

I've seen CDL's not just for canoes ( yeah, It's a trade acceptable term ) but for even main landing gear doors on certain aircraft as well. Speed restriction varies if it's a "main" door or a strut door...though I've never seen the former actually dispatched that way, even for a ferry.

User currently offlineUAL Bagsmasher From United States of America, joined Sep 1999, 2148 posts, RR: 10
Reply 5, posted (14 years 2 months 3 weeks 1 day 16 hours ago) and read 1163 times:

Thanks a lot for all your answers! L-188, you were correct about which fairing was missing 

User currently offlineBoomer From United States of America, joined May 1999, 102 posts, RR: 0
Reply 6, posted (14 years 2 months 3 weeks 1 day 6 hours ago) and read 1146 times:

Although not related to the topic on fairings, I wanted to add to the observation offered by NKP S2. Years ago, I was involved in the repair of a KC-10 that had severe damage to the center landing gear wheelwell. A structural failure allowed the gear to over-rotate back under the fuselage. The aircraft was ferried for repair with the center gear held in place with a cargo strap and the gear doors were removed. As it flew overhead, the air noise was amazingly loud.

User currently offlineBowed up From , joined Dec 1969, posts, RR:
Reply 7, posted (14 years 2 months 2 weeks 2 days ago) and read 1071 times:

The canoes are the fairings for the flaps.

I don't know about United, but Delta doesn't fly our 27's without flap fairings.



User currently offlineGreeneyes53787 From United States of America, joined Aug 2000, 844 posts, RR: 0
Reply 8, posted (14 years 2 months 1 week 6 days 18 hours ago) and read 1057 times:

This is good info. These flap track covers (in most cases) are especially on Airbusses. Their underwing area appears to me like an inverted display shelf for flap track covers.

But is could be noted that these canoes have a specific purpose and really should be on the aircraft. If they are missing don't expect to achieve the max designed level flight speed (rarely achieved anymore). Also, the flap tracks can stay cleaner with these farings in place.

GE


User currently offlineCritter From United States of America, joined Jan 2000, 267 posts, RR: 2
Reply 9, posted (14 years 2 months 1 week 4 days 4 hours ago) and read 1039 times:

All of these responses are correct. The reasons for removal are always due to damage. Many times these fairings are sent for repair and then are repositioned to a maintenance facility for installation at the airlines convienance. Since most of these fairings are very big bulky, and repairable it is very rare to see many spares sitting in stores, unless it is a commonly damaged part.

critter


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