| AD Number | 52-28-03 | 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) | 47 47B 47B3 47D 47D1 47E 47G 47G-2 47G-2A 47G-2A-1 47G-3 47G-3B 47G-3B-1 47G-3B-2 47G-3B-2A 47G-4 47G-4A 47G-5 47G-5A 47H-1 47J 47J-2 47J-2A 47K |
52-28-03 BELL: Applies to All 47 Series Helicopters With the 47-645-002 Gearbox Installed.
Compliance required as directed.
Replace the tail rotor gearbox shaft, P/N 47-645-077-1, when it has accumulated 900 hours of operation.
(Bell's Mandatory Service Bulletin No. 83, Revision A, dated October 2, 1952, covers this same subject.)