AD/HU 369/62 Amdt 4 - Tail Rotor Blade Abrasion Strip
COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
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McDonnell Douglas (Hughes) and Kawasaki 369 Series Helicopters
AD/HU 369/62
Amdt 4
Tail Rotor Blade Abrasion Strip 12/94
Applicability: 1. All 369 Series helicopters equipped with the tail rotor blade part numbers listed in McDonnell Douglas SIN HN-232, DN-179, EN-70, or FN-57, or
2. Installed after production P/N 369A1613-3M, and
3. Any of the SIN listed P/N with a suffix such as the letters M or M-STC added to the dash numbers after production.
Requirement: 1. Visually check each tail rotor blade abrasion strip for evidence of bond failure along the entire abrasion strip/airfoil bond line. If this check results in suspect areas, inspect in accordance with Part I of McDonnell Douglas SIN HN-232, DN- 179, EN-70, or FN-57, as applicable.
Note: MDHC SIN HN-197.2, DN-130.2, EN-19.2, and FN-17.1 dated 23 March 1987
contains additional information on checks and inspections.
- Unless already accomplished inspect in accordance with Part I of McDonnell Douglas SIN HN-232, DN-179, EN-70, or FN-57, as applicable and, if no debonding exists, install tail rotor blade abrasion strip rivets in accordance with Part II of McDonnell Douglas SIN No HN-232, DN-179, EN-70, or FN-57, as applicable.
Note: FAA AD 94-18-08 refers.
Compliance: 1. At each Daily Inspection until two rivets are installed.
- Within 25 hours time in service, or seven days after 23 October 1992, whichever occurs first.
This amendment is effective from 10 November 1994.
Note: This Directive shall be entered on the Maintenance Release as maintenance required. The visual inspection required by Para 1 may be performed by the pilot in command in which case certification is to be made by entering AD/HU 369/62 Amdt 4 against the Daily Inspection certification of the Maintenance Release. A copy of this Airworthiness Directive is to be kept in the aircraft.
Background: Separation of the abrasion strip epoxy bond has been experienced.
COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
The revised Requirement Documents in Amendment 1 included additional blade part numbers, and additional serial numbers for the previously affected part number blades. Amendment 2 was raised to align this Directive with the recently issued Country of Origin AD which requires repetitive inspections followed with a terminating modification action. Amendment 3 is the result of a FAA priority AD raised as the result of an accident from abrasion strip and subsequent tail rotor separation, despite the daily inspection. It also contains additional applicable part numbers. Amendment 4 updates the FAA AD reference which supersedes FAA Priority Letter 92-22-14 and FAA AD 92-02-15. No further work is required as a result of this amendment.