# AD 80-13-14: Fuel Flow Transducer

- Type: Airworthiness directive
- Status: Current
- Products: Cessna 310R, 335, 340A, 402C, 404, 414A and 421C
- Effective: July 22, 1980
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-3844
- Registered aircraft: 1,930 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/086B0055ABEF44C6862569B9004D30FB.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/80-13-14

## The airworthiness directive

80-13-14 CESSNA: Amendment 39-3844. Applies to the following Model 310R, 335, 340A, 402C, 404, 414A, and 42lC airplanes certificated in all categories:

Model Serial Number 310R 1865 335 0044, 0049, 0052, and 0059 340A 0959, 0961, 0962, 0967, 0972, 0978, 0982, 0983, 0984, 0985, 0998, 1002, 1003, 1012, 1014, and 1019 402C 0259, 0263, 0275, 0283, and 0288 404 0612, 0620, 0623, and 0628, 414A 0457, 0458, 0463, 0464, 0466, 0469, 0470, 0472, 0475, 0476, 0482, 0483, 0486, 0487, 0490, 0495, and 0497 421C 0823 through 0866, 0869, and 0870

COMPLIANCE: Required as indicated unless already accomplished.

To preclude failure of the fuel flow transducer and resultant leakage of fuel within the engine compartment, prior to further flight accomplish the following on both engines:

A) Remove engine cowling and inspect Cessna P/N 9910395-9 (Aerosonics Corp 33184-2) fuel flow transducer on each engine for serial number.

B) If the P/N 9910395-9 transducer has a serial number included in the block 2364 through 2930, replace the transducer prior to further flight with a transducer whose serial number is not included in the block 2364 through 2930, reinstall the engine cowling, and accomplish Item D of this AD.

C) If the P/N 9910395-9 transducer serial number is not included in block 2364 through 2930, reinstall the engine cowling, and accomplish Item D of this AD.

D) Make the prescribed entry in the aircraft maintenance record indicating compliance with this AD when B, or C has been accomplished.

E) Any equivalent method of compliance with this AD must be approved by the Chief, Aircraft Certification Program, Federal Aviation Administration, Room 238, Terminal Building No. 2299, Mid-Continent Airport, Wichita, Kansas 67209.

This amendment becomes effective on July 22, 1980, to all persons except those to whom it has already been made effective by an airmail letter from the FAA dated June 24, 1980.

## Affected data sheets (4) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A7CE](https://openairdocs.org/tcds/A7CE): Textron Aviation Inc.; names 3 of 16 models: 421C, 402C, 414A
- [TCDS 3A25](https://openairdocs.org/tcds/3A25): Textron Aviation Inc.; names 2 of 11 models: 335, 340A
- [TCDS 3A10](https://openairdocs.org/tcds/3A10): Textron Aviation Inc.; names 1 of 23 models: 310R
- [TCDS A25CE](https://openairdocs.org/tcds/A25CE): Textron Aviation Inc.; names 1 of 2 models: 404

## 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: 1,930 (1,930 by airframe model, 0 by engine model)
- Makers: Cessna 1,930

Models with the most aircraft:

- [Cessna 340A](https://openairdocs.org/model/cessna-340a): 543 aircraft (airframe model)
- [Cessna 421C](https://openairdocs.org/model/cessna-421c): 496 aircraft (airframe model)
- [Cessna 414A](https://openairdocs.org/model/cessna-414a): 363 aircraft (airframe model)
- [Cessna 310R](https://openairdocs.org/model/cessna-310r): 361 aircraft (airframe model)
- [Cessna 402C](https://openairdocs.org/model/cessna-402c): 115 aircraft (airframe model)
- [Cessna 335](https://openairdocs.org/model/cessna-335): 26 aircraft (airframe model)
- [Cessna 404](https://openairdocs.org/model/cessna-404): 26 aircraft (airframe model)

All 9 models: https://openairdocs.org/ad/80-13-14/models.md
Every aircraft: https://openairdocs.org/ad/80-13-14/aircraft.md

Its text cites no advisory circulars or STCs.

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