# AD 79-09-01: Electrical Leads/Hydraulic Lines Chafing

- Type: Airworthiness directive
- Status: Current
- Products: Boeing 727-100 Series
- Effective: May 8, 1979
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-3452
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/3800C16C78E87D318625683900640BC9.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/79-09-01

## The airworthiness directive

79-09-01 BOEING: Amendment 39-3452. Applies to Model 727-100 series airplanes certificated in all categories listed in Boeing 727 Service Bulletin No. 24-30, revised May 18, 1966, that complied with FAA AD 66-30-02 by having been modified to Option No. 2 in said service bulletin. Compliance required as indicated. To prevent generator electrical lead damage and possible hydraulic fire from cable clamp failure allowing the electrical leads to chafe against hydraulic lines or components, accomplish the following: 1. Within the next 100 hours time-in-service after the effective date of this AD, and every 2,000 hours time-in-service thereafter, inspect the No. 1 generator electrical leads from the pressure feed through fittings (below the floor level) to the engine strut feed through, all generator electrical lead clamps, hydraulic systems, and airframe for routing separation and insulation chafing. Repair or replace any electrical lead, hydraulic line, airframe part or clamp damage as required in accordance with approved maintenance procedures. The repetitive 2,000 hour inspection interval may be adjusted by FAA air carrier maintenance inspectors to the nearest scheduled maintenance inspection period. 2. If the generator electrical leads are not routed with at least three (3) inches separation from hydraulic lines or components, provide additional physical protection with aircraft quality Skydrol resistant insulation wrap and clamp as required. 3. If generator electrical leads are routed with at least three (3) inches separation from hydraulic lines or components, no further action is required under this AD. The manufacturer's specifications and procedures identified and described in this directive are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive who have not already received these documents from the manufacturer, may obtain copies upon request to Boeing Commercial Airplane Company, P.O. Box 3707, Seattle, Washington 98124. These documents may also be examined at FAA Northwest Region, 9010 East Marginal Way South, Seattle, Washington 98108.

This amendment becomes effective May 8, 1979.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A3WE](https://openairdocs.org/tcds/A3WE): The Boeing Company; names 1 of 6 models: 727-100 Series

## Registered aircraft it may apply to (OpenAirDocs)

No registered aircraft matched the models it names.

Its text cites no advisory circulars or STCs.

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