Near midair collision between 2 sightseeing aircraft operating in special flight rules airspace at g...

Attributes
ACN	424178
Time
Date	199901
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : gcn
State Reference	AZ
Altitude	msl bound lower : 8500 msl bound upper : 8500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Twin Otter DHC-6
Flight Phase	cruise other
Flight Plan	VFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	PA-31 Navajo Chieftan/Mojave/Navajo T1020
Flight Phase	cruise other
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : cfi
Experience	flight time last 90 days : 120 flight time total : 3300 flight time type : 600
ASRS Report	424178
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial
Events
Anomaly	conflict : nmac non adherence : far non adherence : required legal separation
Independent Detector	other flight crewa
Consequence	Other
Miss Distance	horizontal : 60 vertical : 120

Narrative:

Twin otter wbound on blue direct route in grand canyon sfar at 8500 ft, was overtaken from behind by a navajo airplane. The captain took controls from copilot to avoid midair collision. As the navajo passed, he then turned on his transponder and a TCASII warning occurred. He admitted his transponder was off. If the captain wouldn't have been talking to the copilot, looking out the right side window, a possible midair collision would have occurred.

Original NASA ASRS Text

Title: NMAC BTWN 2 SIGHTSEEING ACFT OPERATING IN SPECIAL FLT RULES AIRSPACE AT GCN, AZ.

Narrative: TWIN OTTER WBOUND ON BLUE DIRECT RTE IN GRAND CANYON SFAR AT 8500 FT, WAS OVERTAKEN FROM BEHIND BY A NAVAJO AIRPLANE. THE CAPT TOOK CTLS FROM COPLT TO AVOID MIDAIR COLLISION. AS THE NAVAJO PASSED, HE THEN TURNED ON HIS XPONDER AND A TCASII WARNING OCCURRED. HE ADMITTED HIS XPONDER WAS OFF. IF THE CAPT WOULDN'T HAVE BEEN TALKING TO THE COPLT, LOOKING OUT THE R SIDE WINDOW, A POSSIBLE MIDAIR COLLISION WOULD HAVE OCCURRED.

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.

Near midair collision between 2 sightseeing aircraft operating in special flight rules airspace at gcn, az.