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Safety Recommendation Details

Safety Recommendation A-96-111
Details
Synopsis: On March 3, 1991, at 0944 mountain standard time, United Airlines flight 585, a Boeing 737-291 airplane, crashed during an approach to the Colorado Springs, Colorado, airport. The crew of 5 and the 20 passengers were killed. The airplane was destroyed by the impact and a postcrash fire. The weather was clear with unlimited visibility. There were windshear reports during the day. At the time of the accident the surface winds were reported to be out of the northwest at 20 knots gusting to 28. The safety board has not determined the cause(s) of the accident and an investigation of airframe, operational and weather factors is continuing.
Recommendation: TO THE FEDERAL AVIATION ADMINISTRATION: Require the Boeing Commercial Airplane Group and the operating airlines to eliminate the procedure for removal and replacement of the main rudder power control unit rudder position transducer from their respective B-737 maintenance manuals unless the manual provides for testing to verify that the replacement transducer performs its intended function.
Original recommendation transmittal letter: PDF
Overall Status: Closed - Acceptable Action
Mode: Aviation
Location: COLORADO SPGS, CO, United States
Is Reiterated: No
Is Hazmat: No
Is NPRM: No
Accident #: DCA91MA023
Accident Reports: Uncontrolled Descent and Collision with Terrain, United Airlines Flight 585, Boeing 737-200, N999UA, 4 Miles South of Colorado Springs Municipal Airport
Report #: AAR-92-06
Accident Date: 3/3/1991
Issue Date: 10/18/1996
Date Closed: 11/4/1997
Addressee(s) and Addressee Status: FAA (Closed - Acceptable Action)
Keyword(s):

Safety Recommendation History
From: FAA
To: NTSB
Date: 8/7/1997
Response: On November 27, 1996, Boeing issued a revision to its Boeing 737 Maintenance Manual to eliminate the removal and installation sections for the main rudder power control unit rudder position transducer from the maintenance manual. This revision is applicable to the Boeing 737-100/200/300/400/500 series airplanes. I have enclosed a copy of the revision notice for the Board's information. I consider the Federal Aviation Administration's action to be completed on this safety recommendation.

From: NTSB
To: FAA
Date: 7/15/1997
Response: HOWEVER, THE BOARD NOTES THAT THE NOTICE IS ONLY APPLICABLE TO THE BOEING 737-100 & -200 SERIES. BECAUSE THE INSTALLATION OF AN INCORRECTLY ADJUSTED RUDDER POSITION TRANSDUCER IS ALSO POSSIBLE IN THE -300 SERIES, THE MAINTENANCE MANUALS FOR THOSE AIRPLANES SHOULD BE SIMILARLY MODIFIED. PENDING FURTHER CORRESPONDENCE ON THIS ISSUE, A-96-111 IS CLASSIFIED "OPEN--UNACCEPTABLE RESPONSE."

From: FAA
To: NTSB
Date: 1/16/1997
Response: THE FAA AGREES WITH THIS RECOMMENDATION, & BOEING HAS TAKEN APPROPRIATE ACTION TO ADDRESS THIS ISSUE. ON 11/27/96, BOEING ISSUED MAINTENANCE MANUAL REVISION NOTICE NO. 737-232 TO ELIMINATE THE REMOVAL & INSTALLATION SECTIONS FOR THE MAIN RUDDER PCU RUDDER POSITION TRANSDUCER FROM THE AIRCRAFT MAINTENANCE MANUAL. THIS NOTICE IS APPLICABLE TO THE BOEING 737-100/200 SERIES AIRPLANES, I CONSIDER THE FAA'S ACTION TO BE COMPLETED ON THIS RECOMMENDATION.