# AD 64-05-04: Upper Main Oleo Bearings

- Type: Airworthiness directive
- Status: Current
- Products: Piper PA-22, PA-22-108, PA-22-135, PA-22-150 and PA-22-160
- Effective: March 30, 1964
- Published: February 29, 1964
- Issued: February 20, 1964
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Registered aircraft: 2,930 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/07D50B338029E868862569970057F8C5.0001
- DRS record last changed: November 21, 2025
- Page: https://openairdocs.org/ad/64-05-04

## The airworthiness directive

64-05-04 PIPER: Amdt. 693 Part 507 Federal Register February 29, 1964. Applies to Models PA-22, PA-22-108, PA-22-135, PA-22-150, and PA-22-160 Aircraft, Serial Numbers 22-1 through 22-9848.

Compliance required within 25 hours' time in service after the effective date of this AD, unless already accomplished within the preceding 475 hours' time in service, and every 500 hours' time in service thereafter.

  (a) Remove the oleo strut, clean the upper bearing, Piper P/N 452333, and inspect the bearing to determine that its loading groove is on the top side. Remove bearings installed with the loading grooves on the under side.

  (b) Inspect removed bearing, P/N 452333, to insure that 59 balls are installed, no binding or sticking exists, and that the bearing is not worn to the point where the balls are easily dislodged through the loading groove. If any of these defects are found, replace the bearing before further flight.

  (c) Whenever a bearing is removed, clean andinspect the bearing mounting area to insure that it is free of burrs, protrusions, wear or other conditions which could cause bearing misalignment with the strut. Correct deficiencies prior to reinstallation of bearings.

  (d) Repack bearings, P/N 452333, with MIL-G-3278 type lubricant.

  (e) Reinstall bearings, P/N 452333, with the ball loading groove on the upper side.

  (f) When both a new type sealed bearing Piper P/N 452419, and a boot Piper P/N 14087-00, or FAA approved equivalents are incorporated on the aircraft, compliance with (a), (b), (d) and (e) is no longer required.

(Piper Service Letter No. 405, dated October 1, 1963, and Piper Service Memo. No. 73 pertain to this same subject.)

This directive effective March 30, 1964.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 1A6](https://openairdocs.org/tcds/1A6): Piper Aircraft Inc.; names 5 of 8 models: PA-22-108, PA-22-160, PA-22-150, PA-22, PA-22-135

## 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: 2,930 (2,930 by airframe model, 0 by engine model)
- Makers: Piper 2,929, Piper/Pierce Tony 1

Models with the most aircraft:

- [Piper PA-22-150](https://openairdocs.org/model/piper-pa-22-150): 1,200 aircraft (airframe model)
- [Piper PA-22-108](https://openairdocs.org/model/piper-pa-22-108): 587 aircraft (airframe model)
- [Piper PA-22-160](https://openairdocs.org/model/piper-pa-22-160): 456 aircraft (airframe model)
- [Piper PA-22-135](https://openairdocs.org/model/piper-pa-22-135): 409 aircraft (airframe model)
- [Piper PA-22](https://openairdocs.org/model/piper-pa-22): 277 aircraft (airframe model)
- [Piper/Pierce Tony PA-22-150](https://openairdocs.org/model/piper-pierce-tony-pa-22-150): 1 aircraft (airframe model)

All 6 models: https://openairdocs.org/ad/64-05-04/models.md
Every aircraft: https://openairdocs.org/ad/64-05-04/aircraft.md

Its text cites no advisory circulars or STCs.

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