57-12-01: Elevator Control Alinement
FAA order 57-12-01 is an airworthiness directive. The FAA's subject line: Elevator Control Alinement. It names Bell 47: about 478 aircraft on the U.S. register today, though an order usually covers particular versions or serial numbers rather than every one. System: flight controls.
What it applies to as the FAA lists it
- Kind of product
- Aircraft
- Makes
- Scotts-Bell 47 Inc
- Models
- 47H-1
- On this site
- Bell 47 478 registered
Dates and paperwork
- Docket
- Unknown
- Status
- Current
- The FAA's document
- Read the order on the FAA's site
The order itself the regulatory text, as published
Show the full text (981 characters)
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.)
Related safety bulletins advice on the same designs, not orders
2001-02-09SW-01-13 ·
Source: FAA Dynamic Regulatory System, airworthiness directives. The FAA's document is the authority; the register counts are this site's, from the FAA register of November 6, 2026. Connections as data: /graph/directive/57-12-01.json · aircraft systems.