A-06-086
NTSB Safety Recommendation — Aviation
Recommendation text
TO THE FEDERAL AVIATION ADMINISTRATION: Review the maintenance programs for all engine and oil combinations currently in service, with particular emphasis on the evaluation of airplanes approved for extended-range operation with two engines, to determine that operators have gathered and evaluated sufficient data, including operational experience and engine hardware disassembly inspection findings, to ensure that these combinations are not at risk of producing potentially hazardous porous-coke conditions. If such data do not exist or are insufficient, require operators to implement appropriate measures, including periodic inspections, to collect and evaluate the necessary data until the safety risk associated with the presence of porous coke is either ruled out or properly controlled.
In plain language (FlightFinder summary)
The FAA is asked to review maintenance programs for all engine and oil combinations currently in service, with a focus on airplanes approved for extended-range twin-engine operations (ETOPS), to ensure operators have collected and evaluated sufficient data—including operational experience and engine hardware disassembly inspection findings—to address the risk of hazardous porous-coke conditions. If adequate data does not exist, the FAA must require operators to implement measures such as periodic inspections to gather the necessary data until the safety risk is either eliminated or properly controlled.
This plain-language summary is written by FlightFinder to explain the recommendation above. It is not the official wording — the verbatim NTSB text is quoted above.
Details
| Status | Closed - Acceptable Action |
|---|---|
| Mode | Aviation |
| Closed | Mar 28, 2012 |
| NTSB number | DCA04IA002 |
| Addressees | FAA |
External links
NTSB safety recommendations are advisory; addressees are not legally required to adopt them. Source: NTSB CAROL (public domain).