# AD 55-09-04: Hub

- Type: Airworthiness directive
- Status: Current
- Products: Hamilton Standard Division 242
- Superseded by: Nothing supersedes this AD
- Product type: Propeller
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A159AACE8D26F6848625696F0068E3C9.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/55-09-04

## The airworthiness directive

55-09-04 HAMILTON STANDARD: Applies to All 24260 Propeller Hub Barrels Used on Boeing 377 Aircraft. Compliance required as indicated.

As a result of cracks occurring in several 24260 hubs when installed as noted, it is considered desirable to improve the strength characteristics of the hub by reworking and shotpeening the areas subject to such failures. Therefore, in order to minimize the possibility of failures of the nature indicated, accomplish the following:

Inspection. Inspect at every overhaul

Rework. Rework hubs at the earliest opportunity, but not later than at the next overhaul following June 15, 1955, for hubs with 6,000 or more hours of total operating time.

(Hamilton Standard Service Bulletin No. 327 dated November 18, 1954, outlines the required rework.)

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS P-870](https://openairdocs.org/tcds/P-870): Hamilton Standard Division; names 1 of 1 models: 242

## Registered aircraft it may apply to (OpenAirDocs)

No registered aircraft matched the models it names.

Its text cites no advisory circulars or STCs.

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