<< >> NASA ASRS Report 468024, March 2000

Captain of a B737 stopped his descent on the GS and climbed in order to avoid a helicopter crossing through the GS at 500 ft AGL.

Attributes
ACN	468024
Time
Date	200003
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : phx.airport
State Reference	AZ
Altitude	agl single value : 500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : phx.tower
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 8r
Flight Phase	descent : approach
Route In Use	approach : instrument precision
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tower : phx.tower
Make Model Name	Helicopter
Flight Phase	cruise : level
Route In Use	approach : traffic pattern
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 240 flight time total : 10000 flight time type : 6000
ASRS Report	468024
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : multi engine pilot : instrument
Events
Anomaly	conflict : nmac non adherence : required legal separation
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Miss Distance	vertical : 200
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	other

Narrative:

TCASII RA below 500 ft on approach -- helicopter. Tower allowed helicopter to get too close to us and violate our glide path. Helicopter made a turn in violation of tower clearance. After clear of conflict and missed approach begun, we made a safe 40 degree flap landing. Talked to tower supervisors at XA22 and told them I would file report and call it a near miss. In all my yrs of flying (36) this was the only time I had helicopter traffic cross under me inside the FAF or get that clearance. Believe tower erred and helicopter pilot erred.

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Original NASA ASRS Text

Title: CAPT OF A B737 STOPPED HIS DSCNT ON THE GS AND CLBED IN ORDER TO AVOID A HELI XING THROUGH THE GS AT 500 FT AGL.

Narrative: TCASII RA BELOW 500 FT ON APCH -- HELI. TWR ALLOWED HELI TO GET TOO CLOSE TO US AND VIOLATE OUR GLIDE PATH. HELI MADE A TURN IN VIOLATION OF TWR CLRNC. AFTER CLR OF CONFLICT AND MISSED APCH BEGUN, WE MADE A SAFE 40 DEG FLAP LNDG. TALKED TO TWR SUPVRS AT XA22 AND TOLD THEM I WOULD FILE RPT AND CALL IT A NEAR MISS. IN ALL MY YRS OF FLYING (36) THIS WAS THE ONLY TIME I HAD HELI TFC CROSS UNDER ME INSIDE THE FAF OR GET THAT CLRNC. BELIEVE TWR ERRED AND HELI PLT ERRED.

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.