An air carrier freighter crew had to abandon an ADF approach for an ASR approach.

Attributes
ACN	258378
Time
Date	199312
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : hkg
State Reference	FO
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : hkg
Operator	common carrier : air carrier
Make Model Name	Heavy Transport, Low Wing, 4 Turbojet Eng
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 130 flight time total : 13000 flight time type : 5500
ASRS Report	258378
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : critical other spatial deviation
Independent Detector	other controllera other flight crewa
Resolutory Action	controller : issued new clearance flight crew : took evasive action other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

In sum: an air carrier freighter crew had to abandon an ADF approach at hkg because the adfs did not agree with the radar track of approach. Both ADF are used for this approach, and both seemed to be out of tolerance. The reporting captain has tried to get his company to improve the adfs to no avail as 'you don't use them that much anyway' is the attitude expressed by his company. The crew made an ASR approach successfully. The ADF in the subject air carrier heavy transport does not compare favorably with the ADF in the reporter's small aircraft twin.

Original NASA ASRS Text

Title: AN ACR FREIGHTER CREW HAD TO ABANDON AN ADF APCH FOR AN ASR APCH.

Narrative: IN SUM: AN ACR FREIGHTER CREW HAD TO ABANDON AN ADF APCH AT HKG BECAUSE THE ADFS DID NOT AGREE WITH THE RADAR TRACK OF APCH. BOTH ADF ARE USED FOR THIS APCH, AND BOTH SEEMED TO BE OUT OF TOLERANCE. THE RPTING CAPT HAS TRIED TO GET HIS COMPANY TO IMPROVE THE ADFS TO NO AVAIL AS 'YOU DON'T USE THEM THAT MUCH ANYWAY' IS THE ATTITUDE EXPRESSED BY HIS COMPANY. THE CREW MADE AN ASR APCH SUCCESSFULLY. THE ADF IN THE SUBJECT ACR HVT DOES NOT COMPARE FAVORABLY WITH THE ADF IN THE RPTR'S SMA TWIN.

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.