AD Amdt-39-11386

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-39-11386
Status
final_rule
Effective Date
Product Category
engine
Docket
Docket No. 98-NM-382-AD
FR Citation
64 FR 57551

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

The pneumatic augmentation valve may go fully open when an engine fails during initial climb prior to deactivation of the second segment climb switch, potentially resulting in significant loss of thrust from the remaining engine and inadequate initial climb performance.

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

Required Actions

Revise the wiring of the air conditioning pneumatic supply control, if applicable. Revise the wiring of the pneumatic augmentation valve.

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 airplanes, and Model MD-88 airplanes.

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

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