# AD 80-14-08: Airplane Flight Manual Revision

- Type: Airworthiness directive
- Status: Current
- Products: Piper PA-31T
- Effective: July 7, 1980
- Published: July 3, 1980
- Issued: June 23, 1980
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-3829
- Registered aircraft: 87 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/E8E4B36BC1278A24862569A6005CCEC9.0001
- DRS record last changed: November 21, 2025
- Page: https://openairdocs.org/ad/80-14-08

## The airworthiness directive

80-14-08 PIPER: Amendment 39-3829. Applies to Model PA-31T, Serial Numbers 31T-7400002 thru 31T-7620057 and PA-31T-7720001 thru 31T-7920004 certificated in all categories.

Compliance required within 25 hours in service after the effective date of this AD unless already accomplished.

In order to prevent undesirable high altitude (above 20,000 feet) Longitudinal Dynamic Stability (Phugoid) Characteristics, accomplish the following:

a. Incorporate the applicable Airplane Flight Manual/Pilot's Operating Handbook Revision as listed below into the FAA-Delegation Option Authority approved Airplane Flight Manual/Pilot's Operating Handbook in accordance with Piper Instruction, Code 31T-6 dated February 5, 1979, or Piper Instruction Code PFL-31T-790228 dated August 17, 1979.

Airplane Serial Number: 31T-7400002 thru 31T-7620057. AFM/POH Rev. and Part No.: Rev. 11-761 560 (AFM). REM Rev. No.: 790228. Date: 2/28/79.

Airplane Serial Number: 31T-7720001 thru 31T-7920004. AFM/POH Rev. and Part No.: Rev. 5-761 625 (POH). AEM Rev. No.: 781006. Date: 10/6/78.

b. Upon submission of substantiating data by an owner or operator through an FAA Maintenance Inspector, the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region may adjust the inspection intervals specified in this AD.

c. 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 Piper Aircraft Corporation, 820 E. Bald Eagle Street, Lock Haven, Pennsylvania 17745. These documents may also be examined at the Eastern Region, Federal Aviation Administration, Federal Building, JFK International Airport, Jamaica, New York 11430, and at FAA headquarters, 800 Independence Avenue, S.W., Washington, D.C. A historical file on thisAD which includes the incorporated material in full is maintained by the FAA at its headquarters in Washington, D.C., and at the Eastern Region.

This amendment becomes effective July 7, 1980.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A8EA](https://openairdocs.org/tcds/A8EA): Piper Aircraft Inc.; names 1 of 6 models: PA-31T

## 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: 87 (87 by airframe model, 0 by engine model)
- Makers: Piper 87

Models with the most aircraft:

- [Piper PA-31T](https://openairdocs.org/model/piper-pa-31t): 87 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/80-14-08/models.md
Every aircraft: https://openairdocs.org/ad/80-14-08/aircraft.md

Its text cites no advisory circulars or STCs.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.