AD 81-22-01

final rule
Data completeness: 70%

Airworthiness Directives; McDONNELL DOUGLAS DC-9-80 Series Airplanes

AD Number
81-22-01
Status
final_rule
Effective Date
Product Category
aircraft
Docket
Unknown
FR Citation
This information is not available.

Applicability

TypeManufacturerModelDetails
aircraft The Boeing Company DC-9-81 (MD-81) Airworthiness Directives; McDONNELL DOUGLAS DC-9-80 Series Airplanes
aircraft The Boeing Company DC-9-82 (MD-82) Airworthiness Directives; McDONNELL DOUGLAS DC-9-80 Series Airplanes
aircraft The Boeing Company DC-9-83 (MD-83) Airworthiness Directives; McDONNELL DOUGLAS DC-9-80 Series Airplanes
aircraft The Boeing Company DC-9-87 (MD-87) Airworthiness Directives; McDONNELL DOUGLAS DC-9-80 Series Airplanes

Unsafe Condition

Failure of the slat drive mechanism due to improper installation of check valves and restrictors in the slat control valve assembly.

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

Required Actions

Perform a one-time inspection of the slat control valve assembly to verify correct flow direction installation of check valves and restrictors. If improperly installed, conduct dye penetrant or eddy current inspections of the slat drive cylinder support brackets, visual inspections of the slat drive mechanism, and repetitive inspections at intervals not exceeding 350 landings if no cracks are found. Replace cracked brackets and repair damaged wing spar as required.

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

Compliance Time

Within the next 200 landings after the effective date of this AD, whichever occurs later

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

Affected Aircraft

McDonnell Douglas Model DC-9-80 Series airplanes, including DC-9-81 (MD-81), DC-9-82 (MD-82), DC-9-83 (MD-83), DC-9-87 (MD-87), certificated in all categories.

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

Source: Official FAA Source ↗

Retrieved: Apr 8, 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 The Boeing Company DC-9-81 (MD-81)

Related Airworthiness Directives

2004-05-03

final rule

Airworthiness Directives; McDonnell Douglas Model DC-9-81 (MD- 81), DC-9-82 (MD-82), DC-9-83 (MD-83), and DC-9-87 (MD-87) Airplanes; Model MD-88 Airplanes; and Model MD-90-30 Airplanes

Unsafe Condition: Shock strut cylinders

Effective: Mar 15, 2004 Category: aircraft

2000-15-17 R1

final rule

Airworthiness Directives; McDonnell Douglas Model DC-9-81 (MD-81), DC-9-82 (MD-82), DC-9-83 (MD-83), and DC-9-87 (MD-87); Model MD-88 Airplanes; and Model MD-90-30 Series Airplanes

Unsafe Condition: Hydraulic Pipe Assembly in the Aft Fuselage

Effective: Sep 12, 2000 Category: aircraft

99-24-04 C1

final rule

(Correction) Airworthiness Directives; McDonnell Douglas Model DC-9-80 Series Airplanes and Model MD-88 Airplanes

Unsafe Condition: Hi-Lok Pin Fasteners

Effective: Dec 27, 1999 Category: aircraft

99-21-06

final rule

Airworthiness Directives; McDonnell Douglas Model DC-9-81, -82, -83, and -87 Series Airplanes (MD-81, -82, -83, and -87), and Model MD-88 Airplanes

Unsafe Condition: Slat Drive Mechanism Assembly Brackets

Effective: Nov 12, 1999 Category: aircraft

View all The Boeing Company ADs →