# AD 48-12-05: Shear Screw Replacement

- Type: Airworthiness directive
- Status: Current
- Products: Scotts-Bell 47 47B, 47B3 and 47D
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Rotorcraft
- Registered aircraft: 5 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FDE10683EDBFE2FB86256A34004E178B.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/48-12-05

## The airworthiness directive

48-12-05 BELL: Applies to Models 47B Series and 47D.

Compliance required at next 100-hour teardown inspection if less than 600 hours have been accumulated. (If over 600 hours have been accumulated, this change must be accomplished immediately.)

Replace the dural shear screws in the transmission spider assembly with steel shear screws (P/N 47-620-485-1).

(Bell Service Bulletin No. 47C66, revised February 10, 1948, also covers this same subject.)

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS H-1](https://openairdocs.org/tcds/H-1): Scott's-Bell 47 Inc; names 3 of 9 models: 47B, 47B3, 47D

## 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: 5 (5 by airframe model, 0 by engine model)
- Makers: Bell 5

Models with the most aircraft:

- [Bell 47D](https://openairdocs.org/model/bell-47d): 4 aircraft (airframe model)
- [Bell 47B](https://openairdocs.org/model/bell-47b): 1 aircraft (airframe model)

All 2 models: https://openairdocs.org/ad/48-12-05/models.md
Every aircraft: https://openairdocs.org/ad/48-12-05/aircraft.md

Its text cites no advisory circulars or STCs.

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