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Last minute change in lda approach to dca creates confusion for the flight crew of an air carrier large transport.
| Attributes | |
| ACN | 166266 |
| Time | |
| Date | 199012 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : dca |
| State Reference | DC |
| Altitude | msl bound lower : 3000 msl bound upper : 3000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : dca |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | descent : approach |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 10000 flight time type : 300 |
| ASRS Report | 166266 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | other |
| Situations | |
| ATC Facility | procedure or policy : unspecified |
| Navigational Aid | Unspecified |
Narrative:
We were given heading 340 degrees while approaching ott VOR, radar vectors for lda approach to 18. The F/east had copied the ATIS as roslyn lda approach. The captain briefed a roslyn lda approach and I set up the radios. DME was received, but no localizer, which was not unusual since we were still on the opp side of the inbound course. We were vectored for a left downwind and a tight turn in, about a 10 mi final, 'cleared lda approach.' there was still no identify, although the needles were wiggling. A radio call to approach confirmed that it was the 'other' lda approach. After 20 seconds of frantic scrambling, the proper approach was set up, idented, briefed and we continued to a normal approach and landing. Suggestions: 1) if the lda localizer frequency is turned off, why not turn off the associated DME also, it could prevent another situation like the above. 2) rename these 2 approachs a little more distinctly. 3) have the approach controller verify localizer frequency when there is this much similarity, like some places do with simultaneous ILS approachs to parallel runways.
Original NASA ASRS Text
Title: LAST MINUTE CHANGE IN LDA APCH TO DCA CREATES CONFUSION FOR THE FLT CREW OF AN ACR LGT.
Narrative: WE WERE GIVEN HDG 340 DEGS WHILE APCHING OTT VOR, RADAR VECTORS FOR LDA APCH TO 18. THE F/E HAD COPIED THE ATIS AS ROSLYN LDA APCH. THE CAPT BRIEFED A ROSLYN LDA APCH AND I SET UP THE RADIOS. DME WAS RECEIVED, BUT NO LOC, WHICH WAS NOT UNUSUAL SINCE WE WERE STILL ON THE OPP SIDE OF THE INBND COURSE. WE WERE VECTORED FOR A LEFT DOWNWIND AND A TIGHT TURN IN, ABOUT A 10 MI FINAL, 'CLRED LDA APCH.' THERE WAS STILL NO IDENT, ALTHOUGH THE NEEDLES WERE WIGGLING. A RADIO CALL TO APCH CONFIRMED THAT IT WAS THE 'OTHER' LDA APCH. AFTER 20 SECS OF FRANTIC SCRAMBLING, THE PROPER APCH WAS SET UP, IDENTED, BRIEFED AND WE CONTINUED TO A NORMAL APCH AND LNDG. SUGGESTIONS: 1) IF THE LDA LOC FREQ IS TURNED OFF, WHY NOT TURN OFF THE ASSOCIATED DME ALSO, IT COULD PREVENT ANOTHER SITUATION LIKE THE ABOVE. 2) RENAME THESE 2 APCHS A LITTLE MORE DISTINCTLY. 3) HAVE THE APCH CTLR VERIFY LOC FREQ WHEN THERE IS THIS MUCH SIMILARITY, LIKE SOME PLACES DO WITH SIMULTANEOUS ILS APCHS TO PARALLEL RWYS.
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.