AD 2005-20-40

final rule
Data completeness: 70%

Airworthiness Directives; Boeing Model 757-200, -200CB, and -200PF Series Airplanes

AD Number
2005-20-40
Status
final_rule
Effective Date
Product Category
aircraft
Docket
Docket No. FAA-2005-20726
FR Citation
70 FR 59640

Applicability

TypeManufacturerModelDetails
aircraft Boeing 757-200 Airworthiness Directives; Boeing Model 757-200, -200CB, and -200PF Series Airplanes

Unsafe Condition

Cracked flap transmission output gears discovered during routine overhaul could result in undetected flap skew, leading to flap loss, damage to adjacent systems, and reduced controllability.

AI-generated summary from the source AD text. Verify against the official source before acting.

Required Actions

Inspect each trailing edge flap transmission assembly to determine part number and serial number. Investigate and correct as necessary. Mark parts if required. Alternatively, perform a maintenance records check to demonstrate compliance. Replace entire transmission assembly with a new or serviceable unit if defective output gear is found.

AI-generated summary from the source AD text. Verify against the official source before acting.

Compliance Time

Before further flight

AI-generated summary from the source AD text. Verify against the official source before acting.

Affected Aircraft

Boeing Model 757-200, -200CB, and -200PF series airplanes with specific part numbers (251N4050-37, -38, -39, -40; 251N4022-28, -29, -30, -31) and serial numbers 1 through 325 inclusive.

AI-generated summary from the source AD text. Verify against the official source before acting.

Source: Official FAA Source ↗

Retrieved: Apr 6, 2026

Rights: U.S. Government Public Domain

This site is not affiliated with or endorsed by the FAA. Always verify with official sources.

View Official Source ↗ Find More ADs for Boeing 757-200

Related Airworthiness Directives

2016-04-24

final rule

Airworthiness Directives; The Boeing Company Model 757-200 Series Airplanes Modified by Supplemental Type Certificate (STC) ST01529SE or STC ST02278SE

Unsafe Condition: could result in rapid decompression of the airplane, or injury to maintenance and ground crew during ground operations.

Effective: Apr 4, 2016 Category: aircraft

2011-01-15 Recurring

final rule

Airworthiness Directives; The Boeing Company Model 757-200, -200CB, and -300 Series Airplanes

Unsafe Condition: could result in pressure venting and consequent rapid decompression of the airplane.

Effective: Jan 25, 2011 Category: aircraft

2009-12-03

final rule

Airworthiness Directives; Boeing Model 757-200, -200CB, and -300 Series Airplanes

Unsafe Condition: could result in a short circuit and possible fire in the mix bay or smoke in the main cabin.

Effective: Jul 16, 2009 Category: aircraft

View all Boeing ADs →