| AD Number | 50-38-02 | 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) | 47B 47B3 47D 47D1 |
50-38-02 BELL: (a) Applies to All Models 47B, 47B-S, 47B3, 47B3-S, 47D and 47D-S; (b) Applies to Model 47D1, Serial Numbers 145 Through 164, 174 Through 183.
Compliance required before November 15, 1950.
Service difficulties have been experienced involving fan bearing failure due to improper adjustment of the cooling fan belt. This allows the cooling fan to move forward and jam the cyclic controls. To prevent such failures, fan belt tension should be properly adjusted. In addition, a fan shaft washer should be incorporated to prevent the fan from jamming the cyclic control in case bearing failure does occur.
(Bell Service Bulletin No. 61 dated July 20, 1950, covers this subject for models under (a). Bell Service Bulletin No. 72 dated August 4, 1950, covers this subject for models under (b).)