| AD Number | 57-12-01 | Status | Active |
| Effective Date | Not specified | Issue Date | Not specified |
| Docket Number | Unknown | Amendment | N/A |
| Product Type | ["Aircraft"] | Product Subtype | ["Rotorcraft"] |
| CFR Part | --- - Part 39 | CFR Section | N/A |
| Citation | This information is not available. | ||
| Manufacturer(s) | Scotts-Bell 47 Inc |
| Model(s) | 47H-1 |
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.)