# AD 76-11-01: Vibration Effects

- Type: Airworthiness directive
- Status: Current
- Products: Piper PA-31P
- Effective: May 31, 1976
- Published: May 27, 1976
- Issued: May 17, 1976
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-2623
- Registered aircraft: 40 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/3C976B2A8365F8AE8625699E004A8DBB.0001
- DRS record last changed: November 21, 2025
- Page: https://openairdocs.org/ad/76-11-01

## The airworthiness directive

76-11-01 PIPER: Amendment 39-2623. Applies to PA-31P airplanes certificated in all categories.

To prevent possible adverse airplane vibration effects at higher altitudes, accomplish the following within the next 25 hours in service after the effective date of this Airworthiness Directive, unless already accomplished:

  (a) Attach the following operating limitation placard on the pilot's side window molding in full view of the pilot:

OPERATING SPEEDS ALT Vno Vne 1000 mph mph 13 230 278 15 230 268 17 230 258 19 221 248 21 212 238 23 203 228 25 194 218 27 185 208 29 176 198

(NOTE: Speeds shown are CAS)

  (b) Incorporate Piper PA-31P Airplane Flight Manual revision dated January 22, 1976 in Piper PA-31P Airplane Flight Manual 1615.

(Piper Service Bulletin No. 478 refers to this same subject.)

This amendment is effective May 31, 1976.

## 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-31P

## 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: 40 (40 by airframe model, 0 by engine model)
- Makers: Piper 40

Models with the most aircraft:

- [Piper PA-31P](https://openairdocs.org/model/piper-pa-31p): 40 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/76-11-01/models.md
Every aircraft: https://openairdocs.org/ad/76-11-01/aircraft.md

Its text cites no advisory circulars or STCs.

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