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Flight crew of DC8 cargo flight has VOR problem with no lock on to radial set in. They revert to INS guidance and begin turn since frequency is congested. Controller states they are 7 mi south of the radial. Their equipment indicates 2-3 mi south.
| Attributes | |
| ACN | 386410 |
| Time | |
| Date | 199711 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : pdz |
| State Reference | CA |
| Altitude | msl bound lower : 11000 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : lax |
| Operator | common carrier : air carrier |
| Make Model Name | DC-8 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure sid : sid |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | other : unknown |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 90 flight time total : 5400 flight time type : 110 |
| ASRS Report | 386410 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly other other spatial deviation |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Miss Distance | horizontal : 30000 vertical : 2000 |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
Flying prado 5 departure/thermal transition, switched vors to thermal to intercept trm 263 degree radial to trm. Neither VOR locked on. Unable to alert departure of problem due to congestion on frequency. Switched to INS guidance and started turn towards trm when departure called and told us to level at 13000 ft due to traffic conflict. Stated we were 7 mi south of 263 degree radial. It appeared to us that we were 2-3 mi south of radial. Traffic was in sight. Cleared to climb to FL230. Trm locked on at 15000 ft altitude at 45-50 DME. Problem: no VOR lock-on to follow departure. Frequency congestion. To preclude, could have had one VOR go to seal beach and other to thermal.
Original NASA ASRS Text
Title: FLC OF DC8 CARGO FLT HAS VOR PROB WITH NO LOCK ON TO RADIAL SET IN. THEY REVERT TO INS GUIDANCE AND BEGIN TURN SINCE FREQ IS CONGESTED. CTLR STATES THEY ARE 7 MI S OF THE RADIAL. THEIR EQUIP INDICATES 2-3 MI S.
Narrative: FLYING PRADO 5 DEP/THERMAL TRANSITION, SWITCHED VORS TO THERMAL TO INTERCEPT TRM 263 DEG RADIAL TO TRM. NEITHER VOR LOCKED ON. UNABLE TO ALERT DEP OF PROB DUE TO CONGESTION ON FREQ. SWITCHED TO INS GUIDANCE AND STARTED TURN TOWARDS TRM WHEN DEP CALLED AND TOLD US TO LEVEL AT 13000 FT DUE TO TFC CONFLICT. STATED WE WERE 7 MI S OF 263 DEG RADIAL. IT APPEARED TO US THAT WE WERE 2-3 MI S OF RADIAL. TFC WAS IN SIGHT. CLRED TO CLB TO FL230. TRM LOCKED ON AT 15000 FT ALT AT 45-50 DME. PROB: NO VOR LOCK-ON TO FOLLOW DEP. FREQ CONGESTION. TO PRECLUDE, COULD HAVE HAD ONE VOR GO TO SEAL BEACH AND OTHER TO THERMAL.
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.