# AD 64-28-03: Heavy Walled Torque Tube

- Type: Airworthiness directive
- Status: Current
- Products: Piper PA-30
- Effective: December 24, 1964
- Published: December 24, 1964
- Issued: December 17, 1964
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-15
- Registered aircraft: 878 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/B8CA478C6CBC47CF86256997005802F3.0001
- DRS record last changed: November 21, 2025
- Page: https://openairdocs.org/ad/64-28-03

## The airworthiness directive

64-28-03 PIPER: Amdt. 39-15 Part 39 Federal Register December 24, 1964. Applies to Model PA-30 Aircraft, Serial Numbers 30-1 through 30-565.

Compliance required within 30 hours' time in service after the effective date of this AD, unless already accomplished:

As a result of instances of progressively stronger stabilator vibration, accomplish the following:

Install a new design stabilator torque tube, Piper P/N 22655-07, in accordance with the instructions attached to Piper Service Bulletin No. 222A, dated August 10, 1964, or an equivalent modification approved by the Engineering and Manufacturing Branch, FAA Eastern Region and then remove the "Do not exceed 205 m.p.h. IAS" placard.

NOTE: The original stabilator torque tube removed during compliance with this AD should be destroyed to avoid inadvertent reinstallation.

(Piper Service Letter No. 428, dated June 30, 1964, and Piper Service Bulletin No. 222A dated August 10, 1964, pertains to this subject.)This supersedes AD 64-16-07.

This directive effective December 24, 1964.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A1EA](https://openairdocs.org/tcds/A1EA): Piper Aircraft Inc.; names 1 of 3 models: PA-30

## 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: 878 (878 by airframe model, 0 by engine model)
- Makers: Piper 878

Models with the most aircraft:

- [Piper PA-30](https://openairdocs.org/model/piper-pa-30): 878 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/64-28-03/models.md
Every aircraft: https://openairdocs.org/ad/64-28-03/aircraft.md

Its text cites no advisory circulars or STCs.

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