AD Amdt-39-10666

final rule
Data completeness: 70%

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

AD Number
Amdt-39-10666
Status
final_rule
Effective Date
Product Category
engine
Docket
Docket No. 97-NM-105-AD
FR Citation
63 FR 39016

Applicability

TypeManufacturerModelDetails
aircraft McDonnell Douglas DC-9 Airworthiness Directives; McDonnell Douglas Model DC-9, DC-9-80, and C-9 (Military) Series Airplanes, and Model MD-88 Airplanes

Unsafe Condition

Chafing of the FIREX supply pipe against the pneumatic sense pipe assembly could result in a hole in the pipe, preventing proper distribution of fire extinguishing agent within the nacelle during a fire.

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

Required Actions

Inspect for chafing on the FIREX pipe assembly of the number one engine. Repair or replace chafed pipe assemblies with new ones. Modify the FIREX and pneumatic sense pipe assembly clamp marriage.

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

McDonnell Douglas Model DC-9, DC-9-80, C-9 (Military) series, and MD-88 airplanes, including additional airplanes as revised applicability

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 McDonnell Douglas DC-9

Related Airworthiness Directives

2010-25-04

final rule

Airworthiness Directives; McDonnell Douglas Corporation Model DC-9-30, DC-9-40, and DC-9-50 Series Airplanes, Model DC-9-81 (MD-81), DC-9-82 (MD-82), DC-9-83 (MD-83), and DC-9-87 (MD-87) Airplanes, and Model MD-88 and MD-90-30 Airplanes

Unsafe Condition: could result in a fire or an explosion and consequent loss of the airplane.

Effective: Jan 11, 2011 Category: aircraft

2010-23-10 Recurring

final rule

Airworthiness Directives; McDonnell Douglas Corporation Model DC-9-14, DC-9-15, and DC-9-15F Airplanes; and Model DC-9-20, DC-9-30, DC-9-40, and DC-9-50 Series Airplanes

Unsafe Condition: which could cause a possible fuel leak, damage to the wing skin, and structural failure of the upper cap, and result in reduced structural integrity of the airplane.

Effective: Dec 14, 2010 Category: aircraft

2009-15-16

final rule

Airworthiness Directives; McDonnell Douglas Corporation Model DC-9-10 Series Airplanes, DC-9-30 Series Airplanes, DC-9-81 (MD-81) Airplanes, DC-9-82 (MD-82) Airplanes, DC-9-83 (MD-83) Airplanes, DC-9-87 (MD-87) Airplanes, MD-88 Airplanes, and MD-90-30 Airplanes

Unsafe Condition: which could jeopardize flight safety.

Effective: Jul 6, 2010 Category: aircraft

2010-10-20

final rule

Airworthiness Directives; McDonnell Douglas Corporation Model DC-9-30, DC-9-40, and DC-9-50 Series Airplanes

Unsafe Condition: could result in a fire or explosion.

Effective: Jun 21, 2010 Category: aircraft

View all McDonnell Douglas ADs →