Country
United States of America
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Ground accident of a Boeing 727-51C in Denver

Date & Time: Oct 1, 1997 at 0436 LT
Type of aircraft:
Boeing 727-100
Operator:
Registration:
N414EX
Flight Phase:
Taxiing
Flight Type:
Cargo
Survivors:
Yes
Site:
Airport (less than 10 km from airport)
Schedule:
Denver – San Francisco
MSN:
18899/256
YOM:
1966
Flight number:
RYN607
Location:
Denver-Stapleton
Colorado
Country:
United States of America
Region:
North America
Crew on board:
3
Crew fatalities:
Pax on board:
0
Pax fatalities:
Other fatalities:
Total fatalities:
0
Captain / Total flying hours:
15020
Captain / Total hours on type:
7305.00
Aircraft flight hours:
47098
Aircraft flight cycles:
45215
Circumstances:
As the cargo jet was taxiing for takeoff in a non movement area, it was struck by an airport employee shuttle bus. The airplane captain was seriously injured. Visual meteorological conditions prevailed, and the collision occurred during predawn hours. The bus driver said he stopped at the stop sign, turned on the 4-way flasher lights, and looked both ways. He saw one inbound aircraft to the right that had stopped. He did not see the airplane approaching from the left as he started across the cargo ramp. The airplane crew stated they did not see the bus until seconds before impact. Airplane skid marks, measuring 22 and 24 feet in length, were noted on the taxiway. No bus skid marks were noted on the roadway.
Probable cause:
Failure of the bus driver to yield the right of way to oncoming traffic due to his inadequate visual lookout. Factors were visibility restrictions, inadequate driver training by management, and the flight crew's inadequate visual lookout due to their attention being diverted by performing the pre takeoff checklist.
Final Report:

Crash of a Boeing 727-22QC in Windsor Locks

Date & Time: May 3, 1991 at 0553 LT
Type of aircraft:
Boeing 727-100
Operator:
Registration:
N425EX
Flight Phase:
Takeoff (climb)
Flight Type:
Cargo
Survivors:
Yes
Site:
Airport (less than 10 km from airport)
Schedule:
Windsor Locks - Boston
MSN:
19095
YOM:
1966
Location:
Windsor Locks-Bradley
Connecticut
Country:
United States of America
Region:
North America
Crew on board:
3
Crew fatalities:
Pax on board:
0
Pax fatalities:
Other fatalities:
Total fatalities:
0
Captain / Total flying hours:
8500
Captain / Total hours on type:
3600.00
Aircraft flight hours:
46981
Circumstances:
N425EX was on the takeoff roll when the flightcrew experienced a 'thump' that resounded through the airplane. They also observed erratic engine indications from the n°3 engine. The captain aborted the takeoff and stopped the airplane on the runway. The fire warning system activated on the n°3 engine after the airplane came to rest. The crew attempted to extinguish the fire with the airplane's fire extinguishing system; however, they were unsuccessful. The post accident examination of the n°3 engine revealed the high pressure compressor disk had failed due to a fatigue crack that originated from a corrosion pit. The shrapnel from the disk penetrated the engine nacelle and severed the main fuel line for the engine. The fuel ignited and burned into the fuselage, igniting the 12,600 lbs of cargo (US Mail).
Probable cause:
A catastrophic and uncontained failure of the n°3 engine which resulted in a fuel fed fire.
Final Report:

Crash of a Douglas DC-9-15RC in Cleveland: 2 killed

Date & Time: Feb 17, 1991 at 0019 LT
Type of aircraft:
Douglas DC-9
Operator:
Registration:
N565PC
Flight Phase:
Takeoff (climb)
Flight Type:
Cargo
Survivors:
No
Site:
Airport (less than 10 km from airport)
Schedule:
Buffalo - Cleveland - Indianapolis
MSN:
47240
YOM:
1968
Flight number:
RYN590
Location:
Cleveland-Hopkins
Ohio
Country:
United States of America
Region:
North America
Crew on board:
2
Crew fatalities:
Pax on board:
0
Pax fatalities:
Other fatalities:
Total fatalities:
2
Captain / Total flying hours:
10505
Captain / Total hours on type:
505.00
Copilot / Total flying hours:
3820
Copilot / Total hours on type:
510
Aircraft flight hours:
47574
Circumstances:
The flight had flown through weather conducive to airframe ice about 40 minutes prior to the accident during descent into Cleveland. During the 35-minute turnaround at Cleveland the crew did not exit the airplane to conduct an exterior preflight inspection to verify that the wings were free of ice contamination. It was snowing while they were on the ground. The airplane stalled and rolled into the ground immediately after takeoff. There was no operator requirement for the preflight. The flight had not been given training regarding the effects of wing contamination on the airplane. The FAA and the manufacturer have been aware for several years of the propensity of the DC-9 series 10 to the loss of control caused by wing contamination, but neither of them took positive action to include related information in the approved airplane flight manual. Both pilots were killed.
Probable cause:
The failure of the flightcrew to detect and remove ice contamination on the airplane's wings, which was largely a result of a lack of appropriate response by the federal aviation administration, Douglas aircraft company, and ryan international airlines to the known critical effect that a minute amount of contamination has on the stall characteristics of the DC-9 series 10 airplane. The ice contamination led to wing stall and loss of control during the attempted takeoff.
Final Report:
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