B757 flight crew and controller dispute who gave clearance to base at manila.

Attributes
ACN	450912
Time
Date	199910
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : rpll.airport
State Reference	FO
Altitude	msl single value : 3500
Environment
Flight Conditions	IMC
Weather Elements	Rain Thunderstorm
Light	Dusk
Aircraft 1
Controlling Facilities	tower : rpll.tower
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 24
Flight Phase	descent : approach descent : intermediate altitude descent : vacating altitude
Route In Use	arrival : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 60 flight time total : 10000 flight time type : 2000
ASRS Report	450912
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Experience	flight time last 90 days : 120 flight time total : 4000 flight time type : 1600
ASRS Report	451117
Events
Anomaly	non adherence : clearance other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	controller : issued alert controller : issued new clearance controller : issued advisory
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance

Narrative:

Left downwind, vectors to ILS runway 24, in IMC. Flight given descent from 5000 ft to 3500 ft. Just past 7.5 DME fix, flight was given left turn, as a base to final. Captain read back clearance and flight continued. After rolling out on the heading, approach gave an immediate right turn to heading of approximately 090 degrees, away from final. Approach control queried flight as to the 'base leg' turn. Captain responded 'you did, I read it back.' nothing else said. Flight vectored around for uneventful approach and landing. Aircraft didn't have TCASII. (With TCASII, an obvious turn to base leg with aircraft on final would've been questioned.) contributing factors: thunderstorms in area (a number of WX deviations), language hindrance, lack of TCASII in a region of the world where questionable radar exists, and a nonstandard flight number/call sign.

Original NASA ASRS Text

Title: B757 FLC AND CTLR DISPUTE WHO GAVE CLRNC TO BASE AT MANILA.

Narrative: L DOWNWIND, VECTORS TO ILS RWY 24, IN IMC. FLT GIVEN DSCNT FROM 5000 FT TO 3500 FT. JUST PAST 7.5 DME FIX, FLT WAS GIVEN L TURN, AS A BASE TO FINAL. CAPT READ BACK CLRNC AND FLT CONTINUED. AFTER ROLLING OUT ON THE HDG, APCH GAVE AN IMMEDIATE R TURN TO HDG OF APPROX 090 DEGS, AWAY FROM FINAL. APCH CTL QUERIED FLT AS TO THE 'BASE LEG' TURN. CAPT RESPONDED 'YOU DID, I READ IT BACK.' NOTHING ELSE SAID. FLT VECTORED AROUND FOR UNEVENTFUL APCH AND LNDG. ACFT DIDN'T HAVE TCASII. (WITH TCASII, AN OBVIOUS TURN TO BASE LEG WITH ACFT ON FINAL WOULD'VE BEEN QUESTIONED.) CONTRIBUTING FACTORS: TSTMS IN AREA (A NUMBER OF WX DEVS), LANGUAGE HINDRANCE, LACK OF TCASII IN A REGION OF THE WORLD WHERE QUESTIONABLE RADAR EXISTS, AND A NONSTANDARD FLT NUMBER/CALL SIGN.

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.