ASN Wikibase Occurrence # 37526
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| Date: | Thursday 10 February 1994 |
| Time: | 07:13 |
| Type: |  Cessna 421C |
| Owner/operator: | Critical Air Medicine |
| Registration: | N741CA |
| MSN: | 421C0899 |
| Total airframe hrs: | 2916 hours |
| Fatalities: | Fatalities: 2 / Occupants: 3 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | San Antonio, TX -
 United States of America
|
| Phase: | Approach |
| Nature: | Ferry/positioning |
| Departure airport: | San Antonio International Airport, TX (KSAT) |
| Maverick County Memorial International Airport, TX (EGP) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
On February 10, 1994, at 0713 central standard time, a Cessna 421C, N741CA, was destroyed when it collided with a tree and impacted terrain in San Antonio, Texas. The airline transport rated pilot and one passenger were fatally injured, and another passenger received serious injuries. Visual meteorological conditions prevailed.
SHORTLY AFTER TAKEOFF, THE PILOT REPORTED HE HAD 'A PROBLEM' AND NEEDED TO RETURN IMMEDIATELY. WITNESSES OBSERVED DARK BLACK SMOKE COMING FROM BOTH ENGINES. THE AIRPLANE COLLIDED WITH A TREE 1/2-MILE NORTHEAST OF THE RUNWAY THRESHOLD. ANALYSIS OF FUEL SAMPLES REVEALED THE PRESENCE OF APPROXIMATELY 50% JET FUEL. THE RIGHT PROPELLER WAS FOUND FEATHERED AND ENGINE DISASSEMBLY REVEALED A HOLE BURNED IN THE RIGHT ENGINE NUMBER 5 PISTON. LEFT ENGINE DISASSEMBLY REVEALED PISTON EDGES ERODED DOWN TO THE FIRST COMPRESSION RING. FUEL FILLER RESTRICTORS HAD BEEN INSTALLED IN THE AIRPLANE'S FUEL TANKS, BUT THE FUEL TRUCK DID NOT HAVE THE RESTRICTIVE MATING NOZZLE. THE FUEL TRUCK WAS OWNED BY THE FUEL VENDER AND LEASED TO THE FBO.
Probable Cause: IMPROPER SERVICING OF THE AIRPLANE WITH JET FUEL, WHICH RESULTED IN PREIGNITION AND/OR DETONATION AND SUBSEQUENT FAILURE OF PISTONS IN BOTH ENGINES. A FACTOR RELATED TO THE ACCIDENT WAS: THE LACK OF A RESTRICTIVE MATING NOZZLE ON THE REFUELING TRUCK.
Accident investigation:
 |
|
Sources:
NTSB: https://www.ntsb.gov/ntsb/brief.asp?ev_id=20001206X00743
Images:
Photo: NTSB
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Oct-2008 10:30 | ASN archive | Added |
| 21-Dec-2016 19:23 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 12-Oct-2022 02:33 | Captain Adam | Updated [Phase, Departure airport, Destination airport, Narrative, Category, Accident report, Photo] |
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