NTSB Safety Recommendations A-09-55 through -60

[NTSB Press Releases <NTSBPressReleases@xxxxxxxx>]

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                   NTSB SAFETY RECOMMENDATION
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National Transportation Safety Board
Washington, DC 20594

July 17, 2009

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The National Transportation Safety Board recommends that the 
Federal Aviation Administration: 

Require Learjet to change the design of the Learjet 60 thrust 
lever system in future-manufactured airplanes so that the 
reverse lever positions in the cockpit match the positions of 
the thrust reverser mechanisms at the engines when the thrust 
reversers stow. (A-09-55) 

Once design changes are developed per Safety Recommendation A-
09-55, require Learjet 60 operators to retrofit existing 
airplanes so that the reverse lever positions in the cockpit 
match the positions of the thrust reverser mechanisms at the 
engines when the thrust reversers stow. (A-09-56) 

Require Learjet to develop and install improved aural or 
visual cues on future-manufactured Learjet 60 airplanes that 
would allow pilots to recognize an inadvertent thrust reverser 
stowage in a timely manner. (A-09-57) 

Once improved aural or visual cues are developed per Safety 
Recommendation A-09-57, require Learjet 60 operators to 
install those cues on existing Learjet 60 airplanes. (A-09-
58)

Require that all Learjet 60 pilots receive training, for 
takeoff as well as landing phases of flight, on recognizing an 
inadvertent thrust reverser stowage, including the possibility 
that the stowage can occur when the requirements for deploying 
thrust reversers are not fully met, such as when the 
air/ground sensor squat switch circuits are damaged. (A-09-59) 

Evaluate the design of the thrust reverser controls and 
indications in Raytheon Hawker 1000 business jets for 
potential thrust reverser failure modes that are similar to 
those identified in Learjet 60 airplanes and implement 
necessary changes. (A-09-60)




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http://www.ntsb.gov/recs/letters/2009/A09_55_60.pdf

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The complete recommendation letter is available on the Web 
at the URL indicated above.

The letter is in the Portable Document Format (PDF) and can 
be read using the Acrobat Reader 5.0 or later from Adobe 
(http://www.adobe.com/prodindex/acrobat/readstep.html). 
	
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Electronic versions of letters may or may not include 
enclosures; however, related publications, accident 
briefs, and aviation accident synopses may be found 
on the NTSB website.

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