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Boeing 747 Series Receives AD  
User currently offlineChamonix From France, joined Mar 2011, 409 posts, RR: 2
Posted (3 years 5 months 1 week 6 days 2 hours ago) and read 3543 times:
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Boeing 747 Series Receives AD
The FAA on May 11 issued Airworthiness Directive (AD) FAA-2120-AA64 for Boeing Company Model 747-400, -400D, and -400F Series Airplanes, requiring certain thrust reverser control system wiring to the flap control unit (FCU).

The AD was prompted by a report of automatic retraction of the leading edge flaps due to indications transmitted to the FCU from the thrust reverser control system during takeoff. The agency has issued the AD to prevent automatic retraction of the leading edge flaps during takeoff, which could result in reduced climb performance and consequent collision with terrain and obstacles or forced landing of the airplane.

The final rule AD becomes effective June 15, 2011.

9 replies: All unread, jump to last
 
User currently offlineCCA From Hong Kong, joined Oct 2002, 838 posts, RR: 14
Reply 1, posted (3 years 5 months 1 week 6 days 2 hours ago) and read 3538 times:

As a result of the BA incident in JoBerg.


C152 G115 TB10 CAP10 SR-22 Be76 PA-34 NDN-1T C500 A330-300 A340-300 -600 B747-200F -200SF -400 -400F -400BCF -400ERF -8F
User currently offlinetdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 80
Reply 2, posted (3 years 5 months 1 week 6 days 1 hour ago) and read 3521 times:

Quoting Chamonix (Thread starter):
The final rule AD becomes effective June 15, 2011.

Chamonix, I feel like I'm missing something here...the FAA issues several AD's per year on every type out there. What in particular are we looking at in this case?

Tom.


User currently offlineB727LVR From United States of America, joined Jul 2008, 630 posts, RR: 0
Reply 3, posted (3 years 5 months 1 week 6 days ago) and read 3506 times:

Here is the link to the AD (2011-10-02):

http://rgl.faa.gov/Regulatory_and_Gu...5788d004d1f90/$FILE/2011-10-02.pdf

Quoting CCA (Reply 1):
As a result of the BA incident in JoBerg.

The BA aircraft envolved in the incident had RB211 engines installed (per the NTSB), the AD only calls out for aircraft that have the CF6-80C2 & PW4000 series engines.

Am I missing something? Why wouldnt the RR equipped aircraft be included in the AD?

[Edited 2011-05-16 06:37:48]


I'm like a kid in a candy store when it comes to planes!
User currently offlinetravelavnut From Netherlands, joined May 2010, 1630 posts, RR: 7
Reply 4, posted (3 years 5 months 1 week 5 days 23 hours ago) and read 3497 times:

Quoting tdscanuck (Reply 2):
Quoting Chamonix (Thread starter):
The final rule AD becomes effective June 15, 2011.

Chamonix, I feel like I'm missing something here...the FAA issues several AD's per year on every type out there. What in particular are we looking at in this case?

Also the title; "AD 744", Charmonix, can you in the future add a title that is a little less cryptic and little more descriptive?



Live From Amsterdam!
User currently offlinefr8mech From United States of America, joined Sep 2005, 5499 posts, RR: 14
Reply 5, posted (3 years 5 months 1 week 5 days 17 hours ago) and read 3414 times:

Quoting B727LVR (Reply 3):
Am I missing something? Why wouldnt the RR equipped aircraft be included in the AD?

My guess is that auto-slat retract is not installed on RR equipped aircraft, but that's a guess.



When seconds count...the police are minutes away.
User currently offlineB727LVR From United States of America, joined Jul 2008, 630 posts, RR: 0
Reply 6, posted (3 years 5 months 1 week 5 days 17 hours ago) and read 3402 times:

Quoting fr8mech (Reply 5):
My guess is that auto-slat retract is not installed on RR equipped aircraft, but that's a guess.



According to the NTSB:

"British Airways Boeing 747, powered by Rolls-Royce RB211-524H2-T engines, experienced a No. 3 thrust reverser unlock light illumination during the takeoff roll from the Tambo International Airport (FAJS - formerly known as Johannesburg International Airport) while the airplane was traveling at 124 knots. The No. 2 engine thrust reverser unlock light came on at 163 knots and just prior to rotation the slats retracted. The airplane rotated and climbed at a 200 foot per minute rate."

http://www.ntsb.gov/aviationquery/br...518X75604&ntsbno=ENG09WA005&akey=1

I would think they do according to this.



I'm like a kid in a candy store when it comes to planes!
User currently offline747classic From Netherlands, joined Aug 2009, 2179 posts, RR: 14
Reply 7, posted (3 years 5 months 1 week 5 days 17 hours ago) and read 3399 times:

The 747-400's with RR engines are already covered in an earlier issued AD 2009-13-09
Now the GE and PW powered 747-400's are covered in this latest AD. (not so critical, so less time pressure)

Below the exact text :

"The design for the thrust reverser signal to the FCU for the Rolls-Royce Model RB211 series engines is the same as the GE Model CF6-80C2 series engines and PW Model PW4000 series engines. Related AD 2009-13-03, Amendment 39-15942 (74 FR 31169, June 30, 2009), applies to Boeing Model 747-400 and -400F series airplanes powered by Rolls-Royce RB211 series engines, and addresses the same unsafe condition identified in this proposed AD. AD 2009-13-03 was issued as an Immediately Adopted Rule (IAR). The design of the thrust reverser uses a position sensor to indicate that the thrust reverser sleeve is unstowed (not fully stowed). This signal is used for the “REV amber signal” and also is used as an input to the flap control unit. Aerodynamic forces can cause the thrust reverser sleeve to flex which can be enough movement to cause the sensor to indicate that the sleeve is not fully stowed even though the sleeve has not moved from the stowed position.

The reason for the IAR on the Rolls-Royce RB211 series engine installation was that the sensor is sensitive to small sleeve movements. There was also service experience of small sleeve movements that triggered a “REV amber signal,” similar to the incident airplane, but were only single engine occurrences.

The sensors in the CF6-80C2 and PW4000 series engine installations are less sensitive to small sleeve movements. This is supported by service experience. In this case the risk is reduced and this allows for a less aggressive compliance time. This also allows us to proceed with issuing an NPRM to provide the public the opportunity to comment on the merits of the proposed requirements before the final rule is issued.

We have reviewed Boeing Special Attention Service Bulletin 747-78-2183, dated January 12, 2010. This service bulletin describes procedures for modifying certain thrust reverser control system wiring to the FCU in the P414 and P415 power distribution panels for airplanes equipped with GE Model CF6-80C2 series engines. The modification includes re-routing and re-terminating one wire for each engine.

We have also reviewed Boeing Alert Service Bulletin 747-78A2184, dated January 12, 2010. This service bulletin describes procedures for modifying certain thrust reverser control system wiring to the FCU in the P252 and P253 thrust reverser relay panels for airplanes equipped with PW Model PW4000 series engines. The modification includes re-routing and re-terminating one wire for each engine.

We are proposing this AD because we evaluated all relevant information and determined the unsafe condition described previously is likely to exist or develop in other products of the same type design. This proposed AD would require accomplishing the actions specified in the service information described previously."

See : http://govpulse.us/entries/2010/08/0...-and-747-400f-series-airplanes-equ



Operating a twin over the ocean, you're always one engine failure from a total emergency.
User currently offlinePGNCS From United States of America, joined Apr 2007, 2834 posts, RR: 45
Reply 8, posted (3 years 5 months 1 week 5 days 16 hours ago) and read 3390 times:

Quoting tdscanuck (Reply 2):
Chamonix, I feel like I'm missing something here...the FAA issues several AD's per year on every type out there. What in particular are we looking at in this case?

I have to agree with Tom here. What exactly is the point of the thread, or what discussion do you want in reference to this matter, Chamonix? This is a well-known issue in 744 circles.


User currently offlineAndz From South Africa, joined Feb 2004, 8455 posts, RR: 10
Reply 9, posted (3 years 5 months 1 week 4 days 21 hours ago) and read 3228 times:
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Quoting CCA (Reply 1):
As a result of the BA incident in JoBerg.

That would be Jo'burg, or Johannesburg, or JNB.



After Monday and Tuesday even the calendar says WTF...
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