| AD Number | 80-12-51 R2 | Status | Active |
| Effective Date | July 01, 1980 | Issue Date | Not specified |
| Docket Number | Unknown | Amendment | 39-3809 |
| Product Type | ["Engine"] | Product Subtype | Not specified |
| CFR Part | --- - Part 39 | CFR Section | N/A |
| Citation | This information is not available. | ||
| Manufacturer(s) | Pratt & Whitney Division |
| Model(s) | JT3D-1 JT3D-1-MC6 JT3D-1-MC7 JT3D-1A JT3D-1A-MC6 JT3D-1A-MC7 JT3D-3 JT3D-3B JT3D-3C JT3D-5A JT3D-7 JT3D-7A |
80-12-51 R2 PRATT & WHITNEY AIRCRAFT: Amendment 39-3809. Applies to all Pratt & Whitney Aircraft JT3D series turbofan engines.
Compliance required as indicated.
To prevent possible first stage fan blade failures resulting from low cycle fatigue, perform inspections in accordance with the schedule below:
1. Within 50 cycles after May 27, 1980, unless already accomplished, and every 200 cycles thereafter, perform a visual inspection of the critical area of the fan blade convex airfoil surface, in accordance with Pratt & Whitney Aircraft All Operator Telegram Nos. JT3D/72-00/PSE.WJM.0-5-26-1 and JT3D/72-00/PSE.WJM.0-5- 30-1. Remove from service any blade having a visual indication, crack, lap, or blend in the critical area. Any questionable visual indication may be dye penetrant inspected for verification. If the dye check is positive, remove from service. If there is no positive dye check indication, repeat within the next 50 cycles and every 50 cycles thereafter.2. Within 200 cycles after the effective date of this amendment, unless already accomplished, and every 2,200 cycles thereafter, perform an ultrasonic inspection of the fan blade in accordance with the provisions of Pratt & Whitney Alert Service Bulletin No. 5136, dated May 30, 1980, or later revision approved by the Chief, Engineering and Manufacturing Branch, FAA, New England Region. If any crack indications are found, the blade must be removed from service prior to further flight.
3. Once the ultrasonic inspections of Paragraph 2 have been initiated, the visual inspections per Paragraph 1 may be discontinued.
Upon request of the operator, an equivalent method of compliance with the requirements of this AD may be approved by the Chief, Engineering and Manufacturing Branch, FAA, New England Region.
Upon request of the operator, an FAA maintenance inspector, subject to prior approval of the Chief, Engineering and Manufacturing Branch, New England Region, may adjustthe inspection intervals specified in this AD to permit compliance at an established inspection period of the operator if the request contains substantiating data to justify the increase for that operator.
The manufacturer's specifications and procedures identified and described in this directive are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive, who have not already received these documents from the manufacturer, may obtain copies upon request to Pratt & Whitney Aircraft, Division of United Technologies Corporation, 400 Main Street, East Hartford, Connecticut 06108. These documents may also be examined at the FAA, New England Region, 12 New England Executive Park, Burlington, Massachusetts, an at FAA Headquarters, 800 Independence Avenue, S.W., Washington, D.C. A historical file on this AD, which includes the incorporated material in full, is maintained by the FAA at its Headquarters in Washington, D.C., and the New England Region.
This amendment amends TAD No. T 80NE-26 issued May 28, 1980, as amended by TAD No. T 80-12-51 effective June 2, 1980.
This Amendment 39-3809 becomes effective July 1, 1980.