A DHC8-400 flight crew at 10000 ft nearly collides with opposite direction, same altitude traffic 30...

Attributes
ACN	514765
Time
Date	200106
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mso.airport
State Reference	MT
Altitude	msl single value : 10000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zlc.artcc tracon : geg.tracon tower : anc.tower
Operator	common carrier : air carrier
Make Model Name	Dash 8-400
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	cruise : level
Route In Use	enroute airway : v2.airway
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zlc.artcc tracon : geg.tracon
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Retractable Gear
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Route In Use	enroute airway : v2.airway
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 19000 flight time type : 6000
ASRS Report	514765
Person 2
Affiliation	company : air carrier
Function	flight crew : captain
Events
Anomaly	aircraft equipment problem : less severe conflict : nmac non adherence : far non adherence : published procedure other spatial deviation
Independent Detector	aircraft equipment : tcas other flight crewa
Resolutory Action	none taken : insufficient time
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 0 vertical : 50
Supplementary
Problem Areas	Flight Crew Human Performance Airspace Structure Aircraft
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Our flight west on V2 was a maintenance ferry flight from gtf to pdx (quantity 9800 pounds). 30 DME east of mso, we got a TA with no altitude readout. The next thing that happened was a large object appeared in the front window. It was traveling at high rate and went directly from front to back. There was no time to respond. My only reaction was to duck. No ATC facility had any targets as radar coverage in that area is poor. Callback conversation with reporter revealed the following information: the PIC stated that he was down at 10000 ft because the cabin pressurization system was inoperative. He will never, he said, stay on the center of the low altitude airways again. The aircraft appeared to be gray in color and low winged. His flight had just been handed off the spokane approach control from ZLC. His aircraft was truing out at 350 KTS. Hard to say what the other aircraft was doing in speed. The time from TA to aircraft passage was about 7 seconds. Reporter was PIC in right seat giving IOE to student captain in left seat.

Original NASA ASRS Text

Title: A DHC8-400 FLC AT 10000 FT NEARLY COLLIDES WITH OPPOSITE DIRECTION, SAME ALT TFC 30 MI E OF MSO, MT.

Narrative: OUR FLT W ON V2 WAS A MAINT FERRY FLT FROM GTF TO PDX (QUANTITY 9800 LBS). 30 DME E OF MSO, WE GOT A TA WITH NO ALT READOUT. THE NEXT THING THAT HAPPENED WAS A LARGE OBJECT APPEARED IN THE FRONT WINDOW. IT WAS TRAVELING AT HIGH RATE AND WENT DIRECTLY FROM FRONT TO BACK. THERE WAS NO TIME TO RESPOND. MY ONLY REACTION WAS TO DUCK. NO ATC FACILITY HAD ANY TARGETS AS RADAR COVERAGE IN THAT AREA IS POOR. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE PIC STATED THAT HE WAS DOWN AT 10000 FT BECAUSE THE CABIN PRESSURIZATION SYS WAS INOP. HE WILL NEVER, HE SAID, STAY ON THE CTR OF THE LOW ALT AIRWAYS AGAIN. THE ACFT APPEARED TO BE GRAY IN COLOR AND LOW WINGED. HIS FLT HAD JUST BEEN HANDED OFF THE SPOKANE APCH CTL FROM ZLC. HIS ACFT WAS TRUING OUT AT 350 KTS. HARD TO SAY WHAT THE OTHER ACFT WAS DOING IN SPD. THE TIME FROM TA TO ACFT PASSAGE WAS ABOUT 7 SECONDS. RPTR WAS PIC IN R SEAT GIVING IOE TO STUDENT CAPT IN L SEAT.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

A DHC8-400 flight crew at 10000 ft nearly collides with opposite direction, same altitude traffic 30 mi east of mso, mt.