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United Airlines 173

Printed page 4. PDF page 10.

the direction of Portland Approach in a triangular pattern southeast of the airport at 5,000 ft. The pattern kept that aircraft within about 20 nmi of the airport. (See Figure 1.) -> From about 1744:30 until about 1745:23, the cockpit
Open official document at PDF page 10United Airlines, Inc., McDonnell-Douglas DC-8-61, N8082U, Portland, Oregon, December 28, 1978

United Airlines 173

Printed page 10. PDF page 16.

remaining at Portland 13,800 # Throughout the landing delay, Flight 173 remained at 5,000 ft with landing gear down and flaps set at 15°. Under these conditions, the Safety Board estimated that the flight would have been burning fuel at
Open official document at PDF page 16United Airlines, Inc., McDonnell-Douglas DC-8-61, N8082U, Portland, Oregon, December 28, 1978

United Airlines 173

Printed page 18. PDF page 24.

fuel on board at the gate in Denver was 46,700 lbs. The fuel remaining at cruise at 35,000 ft was almost identical in both studies. United's calculations of fuel burn rate for the descent from 35,000 ft to the 5,000-ft
Open official document at PDF page 24United Airlines, Inc., McDonnell-Douglas DC-8-61, N8082U, Portland, Oregon, December 28, 1978

United Airlines 173

Printed page 23. PDF page 29.

arrived in the Portland area with the preplanned 13,800 lbs of fuel and began its delay at 5,000 ft with about 13,334 lbs. The first problem which faced the captain of Flight 173 was the unsafe landing gear indication during
Open official document at PDF page 29United Airlines, Inc., McDonnell-Douglas DC-8-61, N8082U, Portland, Oregon, December 28, 1978

United Airlines 173

Printed page 28. PDF page 34.

company contingency fuel aboard of about 1 hr. The aircraft began holding about 1712 at 5,000 ft with its gear down; this was about 2 hrs 24 min after it departed Denver. The landing delay covered a period of about
Open official document at PDF page 34United Airlines, Inc., McDonnell-Douglas DC-8-61, N8082U, Portland, Oregon, December 28, 1978

United Airlines 173

Printed page 25. PDF page 31.

Ibs of fuel on board. Just minutes earlier, at 1748:56, he was made aware that only 5,000 Ibs remained. During the 16 min between the observation of 5,000 Ibs and 1805, the aircraft would consume at least 3,000 Ibs of
Open official document at PDF page 31United Airlines, Inc., McDonnell-Douglas DC-8-61, N8082U, Portland, Oregon, December 28, 1978