# AD 87-08-04: Thermal Blanket - Type: Airworthiness directive - Status: Current - Products: Boeing 757-200 Series, 757-200CB Series, 757-200PF Series and 757-300 Series - Effective: April 16, 1987 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Large airplane - Amendment: 39-5593 - Registered aircraft: 270 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A46C31834DDAFEF186256959007286A9.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/87-08-04 ## The airworthiness directive 87-08-04 BOEING: Amendment 39-5593. Applies to Model 757 series airplanes equipped with Rolls Royce RB211-535E4 engines, as listed in Boeing Service Bulletin 757-78-0010, dated December 23, 1986, certificated in any category. Compliance required as indicated, unless previously accomplished. To maintain the fire integrity of the thrust reverser C-ducts, accomplish the following within the next 250 flight hours after the effective date of this AD: A. Inspect and repair, if necessary, the thermal blanket in the upper 45 degree section of the C-ducts, as described in Boeing Service Bulletin 757-78-0010, dated December 23, 1986, or later FAA-approved revision. Any damage to the thermal blanket (such as holes, splits, and tears) must be repaired prior to further flight. B. Inspect and repair, if necessary, the thermal blanket in the lower section of the C- ducts and engine components, as described in the Boeing Service Bulletin 757-78-0010, dated December 23, 1986, or later FAA-approved revisions. Any damage discovered must be repaired within the next 250 flight hours. C. An alternate means of compliance or adjustment of the compliance time, which provides an acceptable level of safety, may be used when approved by the Manager, Seattle Aircraft Certification Office, FAA, Northwest Mountain Region. D. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base for the accomplishment of inspections and/or repair required by this AD. All persons affected by this directive who have not already received the appropriate service information from the manufacturer may obtain copies upon request to the Boeing Commercial Airplane Company, P. O. Box 3707, Seattle, Washington 98124-2207. This information may be examined at the FAA, Northwest Mountain Region, 17900 Pacific Highway South, Seattle, Washington, or the Seattle Aircraft Certification Office, 9010 East Marginal Way South, Seattle, Washington. This amendment becomes effective April 16, 1987. ## Affected data sheets (1) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS A2NM](https://openairdocs.org/tcds/A2NM): The Boeing Company; names 4 of 4 models: 757-200CB Series, 757-200PF Series, 757-300 Series, 757-200 Series ## Registered aircraft it may apply to (OpenAirDocs) Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment. - Aircraft: 270 (270 by airframe model, 0 by engine model) - Makers: Boeing 270 Models with the most aircraft: - [Boeing 757-232](https://openairdocs.org/model/boeing-757-232): 63 aircraft (airframe model) - [Boeing 757-224](https://openairdocs.org/model/boeing-757-224): 40 aircraft (airframe model) - [Boeing 757-222](https://openairdocs.org/model/boeing-757-222): 38 aircraft (airframe model) - [Boeing 757-223](https://openairdocs.org/model/boeing-757-223): 23 aircraft (airframe model) - [Boeing 757-236](https://openairdocs.org/model/boeing-757-236): 20 aircraft (airframe model) - [Boeing 757-251](https://openairdocs.org/model/boeing-757-251): 18 aircraft (airframe model) - [Boeing 757-351](https://openairdocs.org/model/boeing-757-351): 16 aircraft (airframe model) - [Boeing 757-231](https://openairdocs.org/model/boeing-757-231): 13 aircraft (airframe model) - [Boeing 757-324](https://openairdocs.org/model/boeing-757-324): 9 aircraft (airframe model) - [Boeing 757-200 SERIES](https://openairdocs.org/model/boeing-757-200-series): 7 aircraft (airframe model) - [Boeing 757-204](https://openairdocs.org/model/boeing-757-204): 6 aircraft (airframe model) - [Boeing 757-225](https://openairdocs.org/model/boeing-757-225): 5 aircraft (airframe model) - [Boeing 757-230](https://openairdocs.org/model/boeing-757-230): 4 aircraft (airframe model) - [Boeing 757-258](https://openairdocs.org/model/boeing-757-258): 3 aircraft (airframe model) - [Boeing 757-256](https://openairdocs.org/model/boeing-757-256): 3 aircraft (airframe model) - [Boeing 757-260PF](https://openairdocs.org/model/boeing-757-260pf): 2 aircraft (airframe model) All 16 models: https://openairdocs.org/ad/87-08-04/models.md Every aircraft: https://openairdocs.org/ad/87-08-04/aircraft.md Its text cites no advisory circulars or STCs. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.