Narrative:

There is a common condition on the 787-8 and 787-9 aircraft where maintenance is finding and documenting heat damage to the engine pylon aft inboard fairings. The finish has been found deteriorated and/or missing from the carbon fiber fairing panel just above the heat shield. The normal interim repair for this condition per the srm (structural repair manual) 54-51-70-03b- 661a-a is to make a temporary seal on the panel per step 2e (1) with speed tape. The repair has a re-inspect interval of 400 hrs. To check the condition of the speed tape and reapply if necessary. These temporary repairs are not coming close to lasting the 400 hrs. Between inspections; which could allow water ingression into the panel and eventual failure of the panel requiring replacement. [Three aircraft] had the speed tape re-applied per the srm procedure on in ZZZ and when the aircraft returned the tape was missing and had to be re-applied. I believe this repair needs to be re-addressed and the procedure changed to address the exposure to extreme heat and air flow over the damaged area. Also; I believe the inspection interval should be lowered to match the general re-inspection requirement of 100 hours as required for speed tape re-inspection in afmm 20-11-33.

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Original NASA ASRS Text

Title: Maintenance Technician reports that interim repair to 787 engine pylon not working.

Narrative: There is a common condition on the 787-8 and 787-9 aircraft where Maintenance is finding and documenting heat damage to the engine pylon aft inboard fairings. The finish has been found deteriorated and/or missing from the carbon fiber fairing panel just above the heat shield. The normal interim repair for this condition per the SRM (Structural Repair Manual) 54-51-70-03b- 661a-a is to make a temporary seal on the panel per step 2e (1) with speed tape. The repair has a re-inspect interval of 400 hrs. to check the condition of the speed tape and reapply if necessary. These temporary repairs are not coming close to lasting the 400 hrs. between inspections; which could allow water ingression into the panel and eventual failure of the panel requiring replacement. [Three aircraft] had the speed tape re-applied per the SRM procedure on in ZZZ and when the aircraft returned the tape was missing and had to be re-applied. I believe this repair needs to be re-addressed and the procedure changed to address the exposure to extreme heat and air flow over the damaged area. Also; I believe the inspection interval should be lowered to match the general re-inspection requirement of 100 hours as required for speed tape re-inspection in AFMM 20-11-33.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.