# AD 75-11-01: Fuel Lines

- Type: Airworthiness directive
- Status: Current
- Products: Cessna 320, 320-1, 320A, 320B, 320C, 320D, 320E and 320F
- Effective: March 22, 1976
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-2548
- Registered aircraft: 137 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/87CEAEC0B05281A386256E0D00503C15.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/75-11-01

## The airworthiness directive

75-11-01 CESSNA: Amendment 39-2204 as amended by Amendment 39-2548. Applies to all Cessna Model 320 Series airplanes.

Compliance: Required as indicated, unless already accomplished.

To detect and correct fuel line chafing or fuel leaks behind the engine firewalls, within 100 hours' time in service after the effective date of this AD, accomplish the following:

A) Visually inspect fuel lines routed in the area behind the engine firewalls and the front wing spars for leaks or chafing in accordance with Cessna Service Letter ME70-39, Revision I, dated April 4, 1975, or subsequent revisions.

B) If as a result of the inspection required by Paragraph A, fuel line leaks or damage is found, prior to further flight, replace the affected line with an airworthy part in accordance with Cessna Service Kit SK402-8C dated February 20, 1975, or subsequent revisions.

C) On Models 320D, 320E and 320F airplanes, in addition to the inspection required in Paragraph A, add additional supporting clamps to the crossover fuel lines in accordance with Cessna Service Kit SK402-8C, dated February 20, 1975, or subsequent revisions.

D) Any equivalent method of compliance with this AD must be approved by the Chief, Engineering and Manufacturing Branch, FAA, Central Region.

Amendment 39-2204 became effective May 20, 1975.

This amendment 39-2548 becomes effective March 22, 1976.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 3A25](https://openairdocs.org/tcds/3A25): Textron Aviation Inc.; names 8 of 11 models: 320, 320D, 320-1, 320B, 320E, 320C, 320F, 320A

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 137 (137 by airframe model, 0 by engine model)
- Makers: Cessna 137

Models with the most aircraft:

- [Cessna 320D](https://openairdocs.org/model/cessna-320d): 30 aircraft (airframe model)
- [Cessna 320E](https://openairdocs.org/model/cessna-320e): 27 aircraft (airframe model)
- [Cessna 320C](https://openairdocs.org/model/cessna-320c): 23 aircraft (airframe model)
- [Cessna 320B](https://openairdocs.org/model/cessna-320b): 21 aircraft (airframe model)
- [Cessna 320](https://openairdocs.org/model/cessna-320): 17 aircraft (airframe model)
- [Cessna 320F](https://openairdocs.org/model/cessna-320f): 12 aircraft (airframe model)
- [Cessna 320A](https://openairdocs.org/model/cessna-320a): 6 aircraft (airframe model)
- [Cessna 320-1](https://openairdocs.org/model/cessna-320-1): 1 aircraft (airframe model)

All 8 models: https://openairdocs.org/ad/75-11-01/models.md
Every aircraft: https://openairdocs.org/ad/75-11-01/aircraft.md

Its text cites no advisory circulars or STCs.

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