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An altitude deviation resulted from inaccuracy in altimeter calibration. Captain cited a failure to monitor during a high-workload, WX complicated, phase of flight.
| Attributes | |
| ACN | 297725 |
| Time | |
| Date | 199502 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : pit |
| State Reference | PA |
| Altitude | msl bound lower : 4000 msl bound upper : 4000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Dawn |
| Aircraft 1 | |
| Controlling Facilities | tower : pit |
| Operator | common carrier : air taxi |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 135 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air taxi |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : commercial pilot : instrument pilot : cfi |
| Experience | flight time last 90 days : 140 flight time total : 2400 flight time type : 400 |
| ASRS Report | 297725 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : overcame equipment problem flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Tight turn issued by controller to intercept localizer. Too fast, due to power settings which were needed to prevent ice. Not familiar with flight characteristics with air brakes extended while changing altitudes, headings, and aircraft configns. Altimeter on the coplts (PF's side) was not accurate to pilot's (PIC) side, which is altitude reporting. Realized altitude deviation, after changing frequency to tower. Corrected to original altitude, continued with approach to successful landing. Contributing factors: relatively inexperienced crew member (with all the flight characteristics), and fatigue. Too many things happening at once: altitude change, heading change, speed adjustments, and aircraft confign. Solutions: better positional awareness, more rest, prioritize workload. Better monitoring by PIC.
Original NASA ASRS Text
Title: AN ALTDEV RESULTED FROM INACCURACY IN ALTIMETER CALIBRATION. CAPT CITED A FAILURE TO MONITOR DURING A HIGH-WORKLOAD, WX COMPLICATED, PHASE OF FLT.
Narrative: TIGHT TURN ISSUED BY CTLR TO INTERCEPT LOC. TOO FAST, DUE TO PWR SETTINGS WHICH WERE NEEDED TO PREVENT ICE. NOT FAMILIAR WITH FLT CHARACTERISTICS WITH AIR BRAKES EXTENDED WHILE CHANGING ALTS, HDGS, AND ACFT CONFIGNS. ALTIMETER ON THE COPLTS (PF'S SIDE) WAS NOT ACCURATE TO PLT'S (PIC) SIDE, WHICH IS ALT RPTING. REALIZED ALTDEV, AFTER CHANGING FREQ TO TWR. CORRECTED TO ORIGINAL ALT, CONTINUED WITH APCH TO SUCCESSFUL LNDG. CONTRIBUTING FACTORS: RELATIVELY INEXPERIENCED CREW MEMBER (WITH ALL THE FLT CHARACTERISTICS), AND FATIGUE. TOO MANY THINGS HAPPENING AT ONCE: ALT CHANGE, HDG CHANGE, SPD ADJUSTMENTS, AND ACFT CONFIGN. SOLUTIONS: BETTER POSITIONAL AWARENESS, MORE REST, PRIORITIZE WORKLOAD. BETTER MONITORING BY PIC.
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.