Airworthiness Directive · Amendment 39-11940 · Pratt & Whitney JT8D Series Turbofan Engines
Pratt & Whitney JT8D Series Turbofan Engines
Superseded. A later AD replaced this one: AD 2002-17-02. Comply with the one in force.
Pratt & Whitney (PW) JT8D-1, -1A, -1B, -7, -7A, -7B, -9, -9A, -11, -15, -15A, -17, -17A, -17R, and -17AR series turbofan engines, installed on but not limited to Boeing 727 and 737 series, and McDonnell Douglas DC-9 series airplanes.
Note 1: This airworthiness directive (AD) applies to each engine identified in the preceding applicability provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For engines that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (c) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it.
This amendment supersedes an existing airworthiness directive (AD), applicable to certain Pratt & Whitney JT8D series turbofan engines, that currently requires revisions to the Time Limits Section (TLS) of the JT8D Turbofan Engine Manual to include required enhanced inspection of selected critical life-limited parts at each piece-part exposure. This action adds additional critical life-limited parts for enhanced inspection. This amendment is prompted by focused inspection procedures that have been developed by the manufacturer for additional critical life-limited parts. The actions specified by this AD are intended to prevent critical life-limited rotating engine part failure, which could result in an uncontained engine failure and damage to the airplane.
To prevent critical life-limited rotating engine part failure, which could result in an uncontained engine failure and damage to the airplane, accomplish the following:
(a) Within the next 30 days after the effective date of this AD, revise the Time Limits Section (TLS) of the JT8D-1, -1A, -1B, -7, -7A, -7B, -9, -9A, -11, -15, -15A, -17, -17A, -17R, and -17AR series Turbofan Engine Manual, and for air carrier operations revise the approved continuous airworthiness maintenance program, by adding the following Critical Life Limited Part Inspection:
“A. Inspection Requirements:
(1) This section has the definitions for individual engine piece-parts and the inspection procedures which are necessary when these parts are removed from the engine.
(2) It is necessary to do the inspection procedures of the piece-parts in Paragraph B when:
(a) The part is removed from the engine and disassembled to the level specified in paragraph B; and
(b) The part has accumulated more than 100 cycles since the last piece part inspection, provided that the part is not damaged or related to the cause of its removal from the engine.
(3) The inspections specified in this section do not replace or make unnecessary other recommended inspections for these parts or other parts.
B. Parts Requiring Inspection:
Note: Piece-part is defined as any of the listed parts with all the blades removed.
| Engine manual | Section | Inspection |
|---|---|---|
| Hub (Disk), 1st Stage Compressor | ||
| 491201 | 72-33-31 | -02, -03, -04 |
| 496501 | 72-33-31 | -02, -03, -04 |
| 504101 | 72-33-31 | -02, -03, -04 |
| 515201 | 72-33-31 | -02, -03, -04 |
| 594301 | 72-33-31 | -02, -03, -04 |
| 640501 | 72-33-31 | -02, -03, -04 |
| 640601 | 72-33-31 | -02, -03, -04 |
| 743301 | 72-33-31 | -02, -03, -04 |
| 749701 | 72-33-31 | -02, -03, -04 |
| 749801 | 72-33-31 | -02, -03, -04 |
| 750001 | 72-33-31 | -02, -03, -04 |
| 750101 | 72-33-31 | -02, -03, -04 |
| 778901 | 72-33-31 | -02, -03, -04 |
| 791401 | 72-33-31 | -02, -03, -04 |
| 791501 | 72-33-31 | -02, -03, -04 |
| 791601 | 72-33-31 | -02, -03, -04 |
| 791701 | 72-33-31 | -02, -03, -04 |
| 791801 | 72-33-31 | -02, -03, -04 |
| 806001 | 72-33-31 | -02, -03, -04 |
| 806101 | 72-33-31 | -02, -03, -04 |
| 817401 | 72-33-31 | -02, -03, -04 |
| 844401 | 72-33-31 | -02, -03, -04 |
| 845401 | 72-33-31 | -02, -03, -04 |
| 848001 | 72-33-31 | -02, -03, -04 |
| 848101 | 72-33-31 | -02, -03, -04 |
| Disk, 2nd Stage Compressor | ||
| 482502 | 72-33-33 | -02 |
| 502502 | 72-33-33 | -02 |
| 520602 | 72-33-33 | -02 |
| 570302 | 72-33-33 | -02 |
| 570402 | 72-33-33 | -02 |
| 678202 | 72-33-33 | -02 |
| 730202 | 72-33-33 | -02 |
| 730302 | 72-33-33 | -02 |
| 730402 | 72-33-33 | -02 |
| 740502 | 72-33-33 | -02 |
| 745702 | 72-33-33 | -02 |
| 745902 | 72-33-33 | -02 |
| 746002 | 72-33-33 | -02 |
| 746802 | 72-33-33 | -02 |
| 760402 | 72-33-33 | -02 |
| 760502 | 72-33-33 | -02 |
| 807502 | 72-33-33 | -02 |
| 500240201 | 72-33-33 | -02 |
| 790832 (Disk assembly) | 72-33-33 | -02 |
| Turbine Disk, First Stage With Integral Shaft | ||
| 481135 | 72-52-04 | -03 |
| 494211 | 72-52-04 | -03 |
| 500701 | 72-52-04 | -03 |
| 516101 | 72-52-04 | -03 |
| 529115 | 72-52-04 | -03 |
| 538901 | 72-52-04 | -03 |
| 544501 | 72-52-04 | -03 |
| 544601 | 72-52-04 | -03 |
| 544701 | 72-52-04 | -03 |
| 553201 | 72-52-04 | -03 |
| 558401 | 72-52-04 | -03 |
| 565101 | 72-52-04 | -03 |
| 565201 | 72-52-04 | -03 |
| 565301 | 72-52-04 | -03 |
| 578201 | 72-52-04 | -03 |
| 579001 | 72-52-04 | -03 |
| HP Turbine Disk, First Stage, Separable | ||
| 587501 | 72-52-02 | -03 |
| 5006101-01 | 72-52-02 | -03 |
| 578001 | 72-52-02 | -03 |
| 5005201-01 | 72-52-02 | -03 |
| 696801 | 72-52-02 | -03 |
| 742501 | 72-52-02 | -03 |
| 752401 | 72-52-02 | -03 |
| 767601 | 72-52-02 | -03 |
| 792801 | 72-52-02 | -03 |
| 856501 | 72-52-02 | -03 |
| 832201 | 72-52-02 | -03 |
| 855701 | 72-52-02 | -03 |
| 856401 | 72-52-02 | -03 |
| 5003601-01 | 72-52-02 | -03 |
| 5003601-021 | 72-52-02 | -03 |
| 5004301-01 | 72-52-02 | -03 |
(b) Except as provided in paragraph (c) of this AD, and notwithstanding contrary provisions in 43.16 of the Federal Aviation Regulations (14 CFR 43.16), these mandatory inspections shall be performed only in accordance with the TLS of the PW JT8D-1, -1A, -1B, -7, -7A, -7B, -9, -9A, -11, -15, -15A, -17, -17A, -17R, and -17AR series Turbofan Engine Manual.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
