ra DIRECTOR
))
7 JUN 63
PRITY
OXCART
SO NIGHT ACTION
SUBJECT IS PROGRESS REPORT ON ACCIDENT INVESTIGATION.
1. BOARD HAS REVIEWED AND APPROVED REPORTS FROM FOLLOWING GROUPS!
EXPLOSION, FIREl GROUP CONCLUDEDAND STRUCTURAL FAILURE DID NOT OCCUR.
CONTROLS AND HYDRAULICS! GROUP CONCLUDEDAND HYDRAULIC SYSTEMS WERE OPERABLE UP TO TIRE OF WEREONTRIBUTING FACTOR IN ACCIDENT.
C OXYGEN, PRESSURlZATlONl OROUP CONCLUDES THESE SYSTEMS WERE OPERABLE UP TO THE TIME OF EJECTION AND WEREACTOR IN ACCIDENT.
D. FUEL SYSTEMS! GROUP CONCLUDED FUEL SYSTEM ICING DID NOT OCCUR, FUEL USED WAS WITHIN SPECIFICATION LIMITS AND THAT THE FUEL SYSTEM OPERATED NORMALLY DURING FLIGHT AND WASACTOR IN THIS ACCIDENT.
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E. POWER PLANTl GROUP HAS COMPLETED TEAR DOWN OF ENGINES AND NO MECHANICAL FAILURE WAS FOUND. RIGHT ENGINE WHICH SHOWED LOW RPM AT IMPACT FLAMED OUT AT LEASTECONDS BEFORE IMPACT DUE TO EITHER FUEL FLOW OR AIR FLOW DISRUPTION AFTER AIRCRAFT STALLED. INLET SPIKES WERE FOUND IN EXTENDED AND LOCKED POSITION. BLEED DOORS WERE IN CLOSED POSITION,
OPERATIONS, WITNESS AND MEDICAL GROUP REPORT HAS RECEIVED INITIAL REVIEW BY BOARD AND REQUESTS FOR CLARIFICATION OF SOME POINTS WAS MADE. GROUP IS CURRENTLY REWRITING REPORT WHICH SHOULD BE AVAILABLE BY EVENING 6 JUN FOR RECONSIDERATION OF BOARD.
ELECTRICAL AND INSTRUMENTATIONS;
A. IT HAS BEEN DETERMINED THRU BENCH CHECK HERELOCKAGE OF THE PITOT LINE FEEDING THE ADC WILL CAUSE THE MACH AND KEAS INDICATION ON THE TD1 TO REMAIN CONSTANT AS LONG AS ALTITUDE IS HELD CONSTANT.
8. IF THE PITOT SYSTEM IS BLOCKED AS ABOVE AND AINITIATEO A3 DESCRIBEDTHE
READ CORRECT AND THE MACH AMD KEAS WOULD ERRONEOUSLY5.
BLOCKAGE MIGHT HAVE BEEN DUE TO PITOT HEAT OR MALFUNCTIONED SWITCH, OR PERHAPS ENTRAPPED MOISTURE.
FOR PITOT AND ADC, NO OTHER SUSPECT AREASOR INSTRUMENT SYSTEMS AT THIS TIME.
4. MAINTENANCE AND RECORDS GROUP IS STILL INVESTIGATINGUSED IN REPLACEMENT OF AIR DATA COMPUTER AMPLIFIER.
For
(illTHREE
INTERIM CONCLUSION! LOCKAGE OF. PITOT SYSTEM COULD HAVE CAUSED THE ERRONEOUS READINGS, S STILLPOSSIBILITY OF ERRONEOUS READINGS DUE TO ADC INTERNAL MALFUNCTION
RECOMMENDATION! ^HLH SHOULD PROVIDE HEAT FOR THE APPROXIMATELYEET OF PITOT TUBING TO THE ADC ON, AND. AIRCRAFT AND UP HAS HEATED NOSE WHICH NEGATES REQUIREMENT. ALSO NOTE THATITOT AND STATIC DRAINS CHECKED AND NO ENTRAPPED MOISTURE FOUND.
NO FURTHER PROGRESS REPORTS ARE ANTICIPATED UNTIL PSYCHOLOGICAL TESTING OF PILOT IS COMPLETED.
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Original document.
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