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20000427017119I

Incident · Minor damage
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FAA incident report · Doug DC-8-62 · Denver, CO · April 27, 2000

FAA Aviation Safety Information Portal

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Date
April 27, 2000 · 21:45 local
Place
Denver, CO
Airport
Denver International
Phase of flight
Normal Cruise
Operating rules
Air carrier (Part 121)
Operator
RRXA
Damage
Minor damage
Aircraft
N990CF
NTSB investigation
NTSBDEN00FA078
Reported as
Doug DC862
People aboard
5
Fatal injuries
0
Pilot’s flight hours
11,000 total5,100 in this make and model165 in the last 90 days
N990CFRegistration cancelled May 15, 2002 · Douglas DC-8-62S/N 46068 · Built 1969Airframe modelDouglas DC-8-62Engine modelPratt & Whitney JT3D-3&3BTurbo-fan

From the FAA’s Accident/Incident Data System (AIDS), through its Aviation Safety Information Portal, as reported. The NTSB investigates accidents separately, and its record of an accident is the fuller one. The aircraft is matched to the registry by N-number and event date, checked against the reported make and model; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

What happened

The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.

(-23)On April 28, 2000, emery flight 025, enroute form sea to day was over eastern Montana. At approxiamtely 0330Z in cruise at FL370, the crew heard a loud bang, the a/c shook and the a/c began to lose pressurization. The crew donned the 02 masks and completed the appropriate checklist and initiated descent to 14,000 ft. engine instruments indicated a failure of #2 engine. The crew secured the #2 engine. Crew diverted to den for maintenance assistance. Den was deemed the nearest suitable airport by virtue of several consideration. After landing, an inspection of the aircraft was performed. The high pressure relief valve aft clamp had uncoupled and therefore the high pressure engine bleed air on #2 engine forced the upper cowling hinges to rupure. The engine cowling penetrated the left fuselage, amking a four-inch diameter hole. The cowling then proceeded to the left horizontal stabilizer and penetrated the leading edge, amking a 12-inch hole. No further damage other than the wiring harness for #2 engine was ripped off.

As the FAA filed it

(-23)ON APRIL 28, 2000, EMERY FLIGHT 025, ENROUTE FORM SEA TO DAY WAS OVER EASTERN MONTANA. AT APPROXIAMTELY 0330Z IN CRUISE AT FL370, THE CREW HEARD A LOUD BANG, THE A/C SHOOK AND THE A/C BEGAN TO LOSE PRESSURIZATION. THE CREW DONNED THE 02 MASKS AND COMPLETED THE APPROPRIATE CHECKLIST AND INITIATED DESCENT TO 14,000 FT. ENGINE INSTRUMENTS INDICATED A FAILURE OF #2 ENGINE. THE CREW SECURED THE #2 ENGINE. CREW DIVERTED TO DEN FOR MAINTENANCE ASSISTANCE. DEN WAS DEEMED THE NEAREST SUITABLE AIRPORT BY VIRTUE OF SEVERAL CONSIDERATION. AFTER LANDING, AN INSPECTION OF THE AIRCRAFT WAS PERFORMED. THE HIGH PRESSURE RELIEF VALVE AFT CLAMP HAD UNCOUPLED AND THEREFORE THE HIGH PRESSURE ENGINE BLEED AIR ON #2 ENGINE FORCED THE UPPER COWLING HINGES TO RUPURE. THE ENGINE COWLING PENETRATED THE LEFT FUSELAGE, AMKING A FOUR-INCH DIAMETER HOLE. THE COWLING THEN PROCEEDED TO THE LEFT HORIZONTAL STABILIZER AND PENETRATED THE LEADING EDGE, AMKING A 12-INCH HOLE. NO FURTHER DAMAGE OTHER THAN THE WIRING HARNESS FOR #2 ENGINE WAS RIPPED OFF.

NTSB investigation

The NTSB’s investigation of this event, with its probable cause and findings. Matched to this report by N-number and date.

NTSB DEN00FA078Accident · No injuriesField investigationFinal reportDenver, COThe failure of the clamp that secured the high-pressure bleed air duct to the high-pressure relief valve. Factors were the resulting excessive pressurization of the engine nacelle, and the subsequent separation of the engine cowling.Apr 28, 2000 · Substantial damage