NTSB Safety Recommendations A-10-46 through A-10-59

NTSB Press Releases <NTSBPressReleases@xxxxxxxx> · Wed, 14 Apr 2010 16:29:23 -0400

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                   NTSB SAFETY RECOMMENDATION
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National Transportation Safety Board
Washington, DC 20594

April 14, 2010

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NTSB Safety Recommendations A-10-46 through A-10-59

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

Provide pilots and maintenance personnel with information 
that (1) transport-category aircraft tires can lose up to 5 
percent pressure per day, (2) it may take only a few days 
for such tires to reach an underinflation level below what 
the aircraft maintenance manual specifies for tire 
replacement, and (3) the underinflation level that would 
require tire replacement is not visually detectable. (A-10-
46)

Require that all 14 Code of Federal Regulations Part 121, 
135, and 91 subpart K operators perform tire pressure checks 
at a frequency that will ensure that the tires remain 
inflated to within aircraft maintenance manual-specified 
inflation pressures. (A-10-47)

Require that aircraft maintenance manuals specify, in a 
readily identifiable and standardized location, required 
maintenance intervals for tire pressure checks (as 
applicable to each aircraft). (A-10-48)

Allow pilots to perform tire pressure checks on aircraft, 
regardless of whether the aircraft is operating under 14 
Code of Federal Regulations Part 91, Part 91 subpart K, or 
Part 135. (A-10-49)

Require tire pressure monitoring systems for all transport-
category airplanes. (A-10-50)

Identify the deficiencies in Learjet's system safety 
analyses, both for the original Learjet 60 design and for 
the modifications after the 2001 accident, that failed to 
properly address the thrust reverser system design flaws 
related to this accident, and require Learjet to perform a 
system safety assessment in accordance with 14 Code of 
Federal Regulations 25.1309 for all other systems that also 
rely on air-ground signal integrity and ensure that hazards 
resulting from a loss of signal integrity are appropriately 
mitigated to fully comply with this regulation. (A-10-51)

Revise available safety assessment guidance (such as 
Advisory Circular 25.1309-1A) for manufacturers to 
adequately address the deficiencies identified in Safety 
Recommendation A-10-51, require that designated engineering 
representatives and their Federal Aviation Administration 
(FAA) mentors are trained on this methodology, and modify 
FAA design oversight procedures to ensure that manufacturers 
are performing system safety analyses for all new or 
modified designs that effectively identify and properly 
mitigate hazards for all phases of flight, including 
foreseeable events during those phases (such as a rejected 
takeoff). (A-10-52)

Revise Federal Aviation Administration Order 8110.48 to 
require that the most current airworthiness regulations 
related to equipment, systems, and installations (14 Code of 
Federal Regulations 25.1309) are applied to all derivative 
design aircraft certificated as changed aeronautical 
products. (A-10-53)

Review the designs of existing derivative design aircraft 
that were certificated as changed aeronautical products 
against the requirements of the current revision of 14 Code 
of Federal Regulations 25.1309 and require modification of 
the equipment, systems, and installations to fully comply 
with this regulation. (A-10-54)

Define and codify minimum simulator model fidelity 
requirements for tire failure scenarios. These requirements 
should include tire failure scenarios during takeoff that 
present the need for rapid evaluation and execution of 
procedures and provide realistic sound and motion cueing. 
(A-10-55)

Once the simulator model fidelity requirements requested in 
Safety Recommendation A-10-55 are implemented, require that 
simulator training for pilots who conduct turbojet 
operations include opportunities to practice responding to 
events other than engine failures occurring both near V1 and 
after V1, including, but not limited to, tire failures. (A-
10-56)

Require that pilots who fly in 14 Code of Federal 
Regulations (CFR) Part 135 operations in aircraft that 
require a type rating gain a minimum level of initial 
operating experience, similar to that specified in 14 CFR 
121.434, taking into consideration the unique 
characteristics of Part 135 operations. (A-10-57)

Require that pilots who fly in 14 Code of Federal 
Regulations (CFR) Part 135 operations in an aircraft that 
requires a type rating gain a minimum level of flight time 
in that aircraft type, similar to that described in 14 CFR 
121.434, taking into consideration the unique 
characteristics of Part 135 operations, to obtain 
consolidation of knowledge and skills. (A-10-58)

Require that tire testing criteria reflect the actual static 
and dynamic loads that may be imposed on tires both during 
normal operating conditions and after the loss of one tire 
and consider less-than-optimal allowable tire conditions, 
including, but not limited to, the full range of allowable 
operating pressures and acceptable tread wear. (A-10-59)

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http://www.ntsb.gov/Recs/letters/2010/A-10-046-059.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). 

An archive of recommendation letters is available at 
http://www.ntsb.gov/recs/letters/letters.htm. 
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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