Commonwealth legislation

AD/JT8D/35 Amdt 1 - Combustion Chamber Outer Case

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AD/JT8D/35 Amdt 1 mandates a one‑time borescope inspection of the combustion‑chamber outer case (CCOC) rear flange on specified Pratt & Whitney JT8D engines (listed part‑ and serial‑numbers). It was issued because certain engines had earlier ultrasonic inspections performed with an out‑of‑calibration probe.

Operators of affected McDonnell Douglas DC‑9, Boeing 737 and Boeing 727 aircraft must complete the inspection within the cycle limits set for each airframe type; operators bear the inspection and compliance costs.

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AD/JT8D/35 Amdt 1 - Combustion Chamber Outer Case

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Pratt and Whitney Turbine Engines - JT8D Series

AD/JT8D/35

Amdt 1

Combustion Chamber Outer Case 1/99

Applicability: Pratt & Whitney JT8D-1, -1A, -1b, -7 ,-7A, -7B, -9, -11, -15, -15A, -17, -17A, -17R

and -17AR turbofan engines, with combustion chamber outer case (CCOC) part numbers 490547, 5421555, 616315, 728829, 728829-001, 730413, 730413-001,

730414, 730414-001, 767197, 767279, or 767279-001 installed.

Requirement: For engines identified by serial number (S/N) in Table 1 of FAA AD 98-04-39, perform a one time borescope inspection of the CCOC rear flange in accordance with paragraph 2.A.(5) of Pratt and Whitney Alert Service Bulletin (ASB) No.A6202, Revision 1, dated 4 January, 1998.

Compliance: Unless previously accomplished:

For engines installed on McDonnell Douglas DC-9 series aircraft, inspect within 1,000 cycles in service (CIS) since the last ultrasonic inspection of the CCOC rear flange performed in accordance with AD AD/JT8D/22 Amdt 4 (FAA AD 96-23- 14), or within 100 CIS after the effective date of this AD, whichever occurs later.

2. For engines installed on Boeing 737 series aircraft, inspect within 1,500 CIS since the last ultrasonic inspection of the CCOC rear flange performed in accordance with AD/JT8D/22 Amdt 4 (FAA AD 96-23-14), or within 100 CIS after the effective date of this AD, whichever occurs later.

3. For engines installed on Boeing 727 series aircraft, inspect within 2,500 CIS since the last ultrasonic inspection of the CCOC rear flange performed in accordance with AD/JT8D/22 Amdt 4 (FAA AD 96-23-14), or within 100 CIS after the effective date of this AD, whichever occurs later.

This Amendment becomes effective on 28 January 1999.

Background: The FAA has advised that certain serial number JD8D engines have been inspected using an out-of-calibration ultrasonic probe. The inspection in question is the subject of AD/JT8D/22 Amdt 4. The one time borescope inspection will ensure the integrity of the CCOC aft flange has not been compromised by the discrepant inspection.

This amendment corrects the reference to FAA AD 98-04-39.

The original issue of this Airworthiness Directive became effective on 8 October 1998.

Source text

Sourced from the Federal Register of Legislation (legislation.gov.au), CC BY 4.0.

1 AD/JT8D/35 Amdt 1 - Combustion Chamber Outer Case