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ASN Wikibase Occurrence # 36496
Last updated: 4 June 2020
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Date:14-MAR-1993
Time:19:42
Type:Silhouette image of generic P28R model; specific model in this crash may look slightly different
Piper PA-28R-201T
Owner/operator:private
Registration: N47402
C/n / msn: 28R-7703371
Fatalities:Fatalities: 2 / Occupants: 2
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Category:Accident
Location:Radium Springs , NM -   United States of America
Phase: En route
Nature:Private
Departure airport:Albuquerque, NM (ABQ)
Destination airport:Las Cruces, NM (LRU)
Investigating agency: NTSB
Narrative:
AT 10,000 FT, THE PILOT REPORTED THAT SHE WAS IN LIGHT SNOW. SUBSEQUENTLY, SHE REPORTED THAT SHE HAD LOST THE ATTITUDE INDICATOR, WAS IN IMC, AND '...WE'RE IN TROUBLE.' NO FURTHER TRANSMISSIONS WERE RECEIVED. THE AIRPLANE SUBSEQUENTLY BROKE UP IN FLIGHT. MICROSCOPIC EXAMINATION OF THE WARNING LIGHT BULB FOR THE VACUUM SYSTEM REVEALED A STRETCHED FILAMENT. PITTING AND SCORING WAS NOTED IN THE BASE OF THE VACUUM PUMP CASE. ENERGY DISPERSIVE X-RAY SPECTROSCOPY PRODUCED SPECTRA OF PARTICLES FOUND IN THE VACUUM PUMP REGULATOR VALVE SIMILAR TO THAT OF THE VACUUM PUMP ROTOR AND VANE FRAGMENTS. WITH 2.2 INCHES OF MERCURY DIFFERENTIAL AIR PRESSURE, THE NORMAL TEST PRESSURE, THE ROTOR OF THE ATTITUDE GYRO ASSEMBLY STARTED, BUT THE ROTOR BEARINGS WERE VERY ROUGH. THIS WAS THE PILOT'S FIRST KNOWN FLIGHT IN ACTUAL INSTRUMENT METEOROLOGICAL CONDITIONS. CAUSE: A TOTAL FAILURE OF THE AIRPLANE'S VACUUM SYSTEM. FACTORS WHICH CONTRIBUTED TO THE ACCIDENT WERE: THE DARK NIGHT, SNOW, THE PILOT'S LOSS OF AIRCRAFT CONTROL, AND THE PILOT'S LACK OF EXPERIENCE IN FLYING IN ACTUAL INTRUMENT METEOROLOGICAL CONDITIONS.

Sources:

NTSB: https://www.ntsb.gov/ntsb/brief.asp?ev_id=20001211X11974

Safety recommendations:

Safety recommendation A-96-178 issued 20 December 1996 by NTSB to FAA
Safety recommendation A-96-179 issued 20 December 1996 by NTSB to FAA


Revision history:

Date/timeContributorUpdates
24-Oct-2008 10:30 ASN archive Added
21-Dec-2016 19:23 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]

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