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Attitude indicator failure. No backup gyroscope and reporter temporarily lost control of aircraft. Descended 700 ft, declared emergency, became VMC and landed with aid of ATC.
| Attributes | |
| ACN | 338877 |
| Time | |
| Date | 199606 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : jfk |
| State Reference | NY |
| Altitude | msl bound lower : 4300 msl bound upper : 5000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : jfk tracon : n90 |
| Operator | general aviation : personal |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : instrument pilot : private |
| Experience | flight time last 90 days : 48 flight time total : 460 |
| ASRS Report | 338877 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : became reoriented flight crew : declared emergency |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
Narrative:
Attitude indicator failed in flight IMC cruise. The unit was a 6 month old rebuilt, installed when autoplt was installed. The front glass separated from case causing problem. All vacuum was lost and standby vacuum did not function because of leak at instrument. Result: lost momentary (2-3 seconds) control of the airplane resulting in an altitude excursion of about 700 ft. Declared an emergency after regaining control of airplane, descended to VFR and landed at blm. GPS found airport because mcguire radar OTS. Ny approach helped with vectors. Backup electronic gyroscope would have been useful. Had nothing to cover ADI which caused distraction till covered with paper.
Original NASA ASRS Text
Title: ATTITUDE INDICATOR FAILURE. NO BACKUP GYROSCOPE AND RPTR TEMPORARILY LOST CTL OF ACFT. DSNDED 700 FT, DECLARED EMER, BECAME VMC AND LANDED WITH AID OF ATC.
Narrative: ATTITUDE INDICATOR FAILED IN FLT IMC CRUISE. THE UNIT WAS A 6 MONTH OLD REBUILT, INSTALLED WHEN AUTOPLT WAS INSTALLED. THE FRONT GLASS SEPARATED FROM CASE CAUSING PROB. ALL VACUUM WAS LOST AND STANDBY VACUUM DID NOT FUNCTION BECAUSE OF LEAK AT INST. RESULT: LOST MOMENTARY (2-3 SECONDS) CTL OF THE AIRPLANE RESULTING IN AN ALT EXCURSION OF ABOUT 700 FT. DECLARED AN EMER AFTER REGAINING CTL OF AIRPLANE, DSNDED TO VFR AND LANDED AT BLM. GPS FOUND ARPT BECAUSE MCGUIRE RADAR OTS. NY APCH HELPED WITH VECTORS. BACKUP ELECTRONIC GYROSCOPE WOULD HAVE BEEN USEFUL. HAD NOTHING TO COVER ADI WHICH CAUSED DISTR TILL COVERED WITH PAPER.
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.