ACR LGT ALT DEV OVERSHOT DURING CLIMB BECAUSE FLT CREW FAILED TO SET ALTIMETER PASSING THE TRANSITION ALT.

1988-04 · NASA ASRS report 86174

Date: 1988-04 · Aircraft: Large Transport; Low Wing; 3 Turbojet Eng

Anomalies: deviation-altitude-overshoot|deviation-discrepancy-procedural-far|deviation-discrepancy-procedural-clearance|inflight-event-encounter-weather-turbulence

Synopsis

ACR LGT ALT DEV OVERSHOT DURING CLIMB BECAUSE FLT CREW FAILED TO SET ALTIMETER PASSING THE TRANSITION ALT.

Narrative

ACFT WAS LEVELED OFF AT A CRUISING ALT OF 23000'. HOWEVER THE ALTIMETERS HAD NOT BEEN RESET FROM 29.45 TO 29.92 CAUSING AN ERROR OF APPROX PLUS 400'! ERROR DISCOVERED BY THE COPLT WHO WAS FLYING THE AIRPLANE AND THE ACFT WAS STARTED DOWN TO THE CORRECT ALT. ABOUT THE SAME TIME ATC ALERTED THE CREW TO THE ERRONEOUS ALT. THE FAILURE TO RESET THE ALTIMETERS WAS DIRECT RESULT OF A DISAGREEMENT WHICH WAS TAKING PLACE AT THE TIME BETWEEN THE FIRST AND SECOND OFFICERS AND THE CAPT. CLIMBING THROUGH 15000' WITH A TRUE AIR TEMP PLUS 5 DEG C IN PRECIPITATION ICE BEGAN TO ACCUMULATE ON THE WINDSHIELD. DESPITE INITIAL SUGGESTIONS; THEN REQUESTS; AND FINALLY DEMANDS; CAPT REFUSED TO PUT ON THE ENGINE ANTI-ICE ; IN CONFLICT WITH THE ACFT MANUAL; COMPANY AND FAA PROCEDURES; CAUSING MUCH CONCERN TO BOTH OTHER CREW MEMBERS. FIRST OFFICER INCREASED RATE OF CLIMB TO GET ABOVE PRECIPITATION LEVEL FASTER. AT APPROX 22000' ACFT ENTERED THE CLEAR. ALTHOUGH THE ISSUE OF THE ANTI-ICE BECAME AT THIS POINT THE CAPT CONTINUED TO ARGUE CAUSING FURTHER DISTR AND REFERRING HIS EXPERIENCE ON THE MLG. I REFRAINED MYSELF FROM FURTHER DISCUSSION ESPECIALLY AFTER THE EXPERIENCE WITH THE ALTIMETER ERROR. LATER; I TOLD THE CAPT THAT; UNLESS I GOT A DEFINITIVE PERSONAL COMMITTMENT FROM HIM THAT THE ACFT AND SYSTEMS WOULD BE OPERATED STRICTLY IN ACCORDANCE WITH THE FLT MANUALS ON THE NEXT FLT SEGMENT BACK TO DCA; I WOULD NOT FLY WITH HIM. THE SECOND OFFICER CONCURRED. THE CAPT GAVE ME THIS COMMITTMENT AND FROM THEN ON WE OPERATED WITHOUT INCIDENT. I BELIEVE THIS INDIVIDUAL WILL NOT DEVIATE IN THE FUTURE.

Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.

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