# AD 57-12-01: Elevator Control Alinement

- Type: Airworthiness directive
- Status: Current
- Products: Scotts-Bell 47 47H-1
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Rotorcraft
- Registered aircraft: 6 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/868E69887C4A7FCD86256A34004FD163.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/57-12-01

## The airworthiness directive

57-12-01 BELL: Applies to Model 47H1 Helicopters Serial Numbers 1347 Through 1349 and 1351 Through 1371.

Compliance required as soon as possible but not later than August 1, 1957.

Due to possible misalignment in the fore and aft synchronized elevator control pulley quadrant which may cause the control cables to be misaligned and cause chafing, the following inspection and rework is necessary.

1. Inspect the synchronized elevator control cables for alinement into the cable groove on the forward 47-267-112-5 pulley quadrant and the aft 47-267-410-1 elevator pulley quadrant. Inspect the forward 47-267-112-5 pulley quadrant support bracket bolt holes for elongation. If alinement and bolt holes are satisfactory, no rework to the support bracket is necessary.

2. If bolt hole elongation or misalignment exist, the rework as outlined in Bell Service Bulletin No. 111 is required.

(Bell Service Bulletin No. 111, dated March 15, 1957, 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 1 of 9 models: 47H-1

## 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: 6 (6 by airframe model, 0 by engine model)
- Makers: Bell 6

Models with the most aircraft:

- [Bell 47H-1](https://openairdocs.org/model/bell-47h-1): 6 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/57-12-01/models.md
Every aircraft: https://openairdocs.org/ad/57-12-01/aircraft.md

Its text cites no advisory circulars or STCs.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.