# AD 75-20-03: Usable Fuel Data

- Type: Airworthiness directive
- Status: Current
- Products: Piper PA-34-200 and PA-34-200T
- Effective: October 10, 1975
- Published: October 2, 1975
- Issued: September 18, 1975
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-2364
- Registered aircraft: 735 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/E573D7C414D5D1898625699900514A52.0001
- DRS record last changed: November 21, 2025
- Page: https://openairdocs.org/ad/75-20-03

## The airworthiness directive

75-20-03 PIPER AIRCRAFT CORPORATION: Amendment 39-2364. Applies to Model PA-34-200 airplanes, serial numbers 34-7250001 through 34-7450220 and Model PA-34-200T airplanes, serial numbers 34-7570001 through 34-7570308, certificated in all categories.

Compliance required within the next 50 hours time in service after the effective date of this AD, unless already accomplished.

To provide revised usable fuel data, accomplish the following:

Replace the existing fuel quantity placards and revise the fuel system data in Airplane Flight Manual in accordance with Piper Service Bulletin Number 438 or in an equivalent manner approved by the Chief, Engineering and Manufacturing Branch, Federal Aviation Administration, P.O. Box 20636, Atlanta, Georgia 30320.

This amendment becomes effective October 10, 1975.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A7SO](https://openairdocs.org/tcds/A7SO): Piper Aircraft Inc.; names 2 of 5 models: PA-34-200 (Seneca), PA-34-200T (Seneca II)

## 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: 735 (735 by airframe model, 0 by engine model)
- Makers: Piper 735

Models with the most aircraft:

- [Piper PA-34-200T](https://openairdocs.org/model/piper-pa-34-200t): 563 aircraft (airframe model)
- [Piper PA-34-200](https://openairdocs.org/model/piper-pa-34-200): 172 aircraft (airframe model)

All 2 models: https://openairdocs.org/ad/75-20-03/models.md
Every aircraft: https://openairdocs.org/ad/75-20-03/aircraft.md

Its text cites no advisory circulars or STCs.

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