# AD 80-11-06: Aircraft Data Plate

- Type: Airworthiness directive
- Status: Historical
- Products: Piper PA-31T and PA-31T1
- Effective: May 28, 1980
- Superseded by: [AD 2012-10-09](https://openairdocs.org/ad/2012-10-09)
- Product type: Aircraft, Small airplane
- Amendment: 39-3776
- Registered aircraft: 151 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/64A7F5D65E031E6D8625699E007693FE.0001
- DRS record last changed: August 7, 2025
- Page: https://openairdocs.org/ad/80-11-06

## The airworthiness directive

80-11-06 PIPER: Amendment 39-3776. Applies to Piper PA-31T1 and PA-31T Model airplanes, Serial Nos. 31T-78O4001 thru 31T-7904053, 31T-7904056, and 31T-7904057 certificated in all categories.

To correct an error on the data plate, within the next 100 hours in service unless already accomplished, accomplish the following:

a. Locate the aircraft data plate (Part No. 79644-4), on the left side of the fuselage belly, just below the forward part of the cabin door.

b. Using an acceptable method of permanent marking (metal stamp, engraver, electric pencil, etc.), inscribe the numeral "1" behind "PA-31T" in the gold block in which "Model" is designated.

Before Modification: "Model PA-31T" After Modification: "Model PA-31T1"

This amendment is effective May 28, 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 2 of 6 models: PA-31T, PA-31T1

## 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: 151 (151 by airframe model, 0 by engine model)
- Makers: Piper 151

Models with the most aircraft:

- [Piper PA-31T](https://openairdocs.org/model/piper-pa-31t): 87 aircraft (airframe model)
- [Piper PA-31T1](https://openairdocs.org/model/piper-pa-31t1): 64 aircraft (airframe model)

All 2 models: https://openairdocs.org/ad/80-11-06/models.md
Every aircraft: https://openairdocs.org/ad/80-11-06/aircraft.md

## Related documents

- [AD 2012-10-09](https://openairdocs.org/ad/2012-10-09): Placards and Markings · Piper PA-31T and PA-31T1. Effective Jun 29, 2012. Supersedes this AD

Its text cites no advisory circulars or STCs.

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