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B727-200 aircraft in holding pattern deviated from assigned altitude when PF, first officer, altimeter vibrator circuit breaker popped causing altimeter error.
| Attributes | |
| ACN | 388544 |
| Time | |
| Date | 199712 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : atl |
| State Reference | GA |
| Altitude | msl bound lower : 22600 msl bound upper : 23000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : ztl |
| Operator | common carrier : air carrier |
| Make Model Name | B727-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 110 flight time total : 5366 flight time type : 25 |
| ASRS Report | 388544 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 240 flight time total : 19000 flight time type : 5000 |
| ASRS Report | 388070 |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude non adherence : clearance |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Descending to FL230 while holding at macey intersection. First officer had been having trouble with a sticking barometric altimeter. Aircraft descended through assigned altitude of FL230. Captain called for climb back up when aircraft approached FL227. First officer's altimeter had stuck at FL231. First officer then leveled back at FL230 reference the captain's altimeter. Lowest altitude reached was FL226 (-400 ft). Subsequently found first officer altimeter vibrator circuit breaker popped. Aircraft on autoplt (block iv) with no altitude capture capability. First officer also relatively new on aircraft. Lack of familiarity may have contributed. No adverse calls from ZTL.
Original NASA ASRS Text
Title: B727-200 ACFT IN HOLDING PATTERN DEVIATED FROM ASSIGNED ALT WHEN PF, FO, ALTIMETER VIBRATOR CIRCUIT BREAKER POPPED CAUSING ALTIMETER ERROR.
Narrative: DSNDING TO FL230 WHILE HOLDING AT MACEY INTXN. FO HAD BEEN HAVING TROUBLE WITH A STICKING BAROMETRIC ALTIMETER. ACFT DSNDED THROUGH ASSIGNED ALT OF FL230. CAPT CALLED FOR CLB BACK UP WHEN ACFT APCHED FL227. FO'S ALTIMETER HAD STUCK AT FL231. FO THEN LEVELED BACK AT FL230 REF THE CAPT'S ALTIMETER. LOWEST ALT REACHED WAS FL226 (-400 FT). SUBSEQUENTLY FOUND FO ALTIMETER VIBRATOR CIRCUIT BREAKER POPPED. ACFT ON AUTOPLT (BLOCK IV) WITH NO ALT CAPTURE CAPABILITY. FO ALSO RELATIVELY NEW ON ACFT. LACK OF FAMILIARITY MAY HAVE CONTRIBUTED. NO ADVERSE CALLS FROM ZTL.
Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.