AD 2001-20-15

Recurring final rule
Data completeness: 70%

Airworthiness Directives; McDonnell Douglas Model DC-9 Series Airplanes and MD-88 Airplanes

AD Number
2001-20-15
Status
final_rule
Effective Date
Product Category
aircraft
Docket
Docket No. 2001-NM-264-AD
FR Citation
66 FR 51857

Applicability

TypeManufacturerModelDetails
aircraft McDonnell Douglas DC-9 Airworthiness Directives; McDonnell Douglas Model DC-9 Series Airplanes and MD-88 Airplanes

Unsafe Condition

Internal phase-to-phase short circuiting of the AC cross-tie relay caused by metallic dust accumulation, which could result in internal arcing of the relay and smoke and/or fire in the cockpit and cabin.

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

Required Actions

Inspect to determine if a certain AC cross-tie relay is installed; replace any AC cross-tie relay, part number 914F567-3, with a Sundstrand (Westinghouse) relay, part number 9008D09 series or 914F567-4; and perform repetitive cleaning, inspection, repair, and testing of any Sundstrand (Westinghouse) AC cross-tie relay, part number 914F567-4.

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

Compliance Time

Within 90 days after the effective date of this AD.

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

Affected Aircraft

McDonnell Douglas Model DC-9 series airplanes and MD-88 airplanes, specifically those equipped with AC cross-tie relays, part numbers 914F567-3 and 914F567-4.

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

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View Official Source ↗ Find More ADs for McDonnell Douglas DC-9

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