A-88-131
NTSB Safety Recommendation — Aviation
Recommendation text
THE NTSB RECOMMENDS THAT THE FEDERAL AVIATION ADMINISTRATION: FOR BOEING 747 AIRPLANES WITH THE EARLY PRODUCTION FLAP TRACKS, REQUIRE A MAGNIFIED VISUAL OR OTHER NONDESTRUCTIVE INSPECTION, WITHIN 20 FLIGHT CYCLES OF ANY PREVIOUS INSPECTION, OF THE FORWARD BOLT HOLE BORES OF THE INBOARD FLAP TRACKS FOR CORROSION PITTING AND CRACKS USING DAMAGE TOLERANCE CRITERIA DEVISED BY BOEING, AND ESTABLISH PERIODIC INSPECTION INTERVALS FOR THE BOLT HOLE BORES CONSISTENT WITH EARLY DETECTION OF CORROSION PITTING IN THE BORES. (URGENT)
In plain language (FlightFinder summary)
The FAA is asked to mandate a magnified visual or other nondestructive inspection of the forward bolt hole bores in the inboard flap tracks on Boeing 747 aircraft with early production flap tracks. This inspection must occur within 20 flight cycles of any previous inspection and use damage tolerance criteria from Boeing to detect corrosion pitting and cracks. Additionally, the FAA must establish periodic inspection intervals for these bolt hole bores to ensure early detection of corrosion pitting.
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 | Jun 2, 1989 |
| NTSB number | CHI88FA110 |
| Addressees | FAA |
External links
NTSB safety recommendations are advisory; addressees are not legally required to adopt them. Source: NTSB CAROL (public domain).