A-90-100
NTSB Safety Recommendation — Aviation
Recommendation text
THE NTSB RECOMMENDS THAT THE FEDERAL AVIATION ADMINISTRATION: ISSUE AN AIRWORTHINESS DIRECTIVE TO REQUIRE IMMEDIATE INSPECTION OR TESTING OF FLOAT SWITCH WIRING FROM THE FLOAT SWITCHES TO THE REFUELING PANEL FOR CHAFFED OR DAMAGED INSULATION MATERIAL ON BOEING 737-300, -400, AND -500 SERIES AIRPLANES. THE DIRECTIVE SHOULD STATE THAT SPECIAL EMPHASIS BE PLACED ON INSPECTING THE WIRE BUNDLE WHERE IT PASSES THROUGH THE WING PYLON VAPOR SEALS AND UNDER THE WIRE BUNDLE CLAMPS. (URGENT)
In plain language (FlightFinder summary)
The National Transportation Safety Board asks the Federal Aviation Administration to issue an airworthiness directive requiring immediate inspection or testing of float switch wiring for chaffed or damaged insulation on Boeing 737-300, -400, and -500 series airplanes. The directive should specify that extra attention be given to the wire bundle where it goes through the wing pylon vapor seals and under the wire bundle clamps.
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 - Unacceptable Action |
|---|---|
| Mode | Aviation |
| Closed | Mar 24, 1992 |
| NTSB number | DCA90RA028 |
| Addressees | FAA |
External links
NTSB safety recommendations are advisory; addressees are not legally required to adopt them. Source: NTSB CAROL (public domain).