AD/AS 355/31 - Tail Rotor Gearbox Casing
1AD/AS 355/31 - Tail Rotor Gearbox Casing
Start here
Get a plain-English read of 1
Turn the raw legal text into a practical explanation grounded in AD/AS 355/31 - Tail Rotor Gearbox Casing.
COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Image unavailable in extracted text
Eurocopter AS 355 (Twin Ecureuil) Series Helicopters
AD/AS 355/31 Tail Rotor Gearbox Casing 1/88
Applicability: All model AS 355 Series helicopters.
Requirement: 1. Inspect the tail rotor gearbox casing in accordance with Para 1C(2) of SB No 05.18.
- Inspect and modify the tail rotor gearbox in accordance with Para 1C(3) of SB No 05.18.
Compliance: For Para 1: Within 50 hours time in service after 18 November 1987 and thereafter at intervals not exceeding 50 hours time in service, until modification AMS 350A07- 8535 (polishing blend radii) is incorporated. After modification, inspect at intervals not exceeding 400 hours time in service.
For Para 2: Prior to exceeding 1100 hours total time in service or within 100 hours time in service after 18 November 1987, whichever is the later.
Background: The manufacturer has received reports of cracking in the blade horn support yoke radius just inboard of where the tail rotor control bellcrank pivot bolt is located.