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Flight crew of an medium large transport air carrier aircraft deviated from assigned SID track due to fluctuating CDI needles.
| Attributes | |
| ACN | 253943 |
| Time | |
| Date | 199310 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : pmd airport : bur |
| State Reference | CA |
| Altitude | msl bound lower : 12000 msl bound upper : 12500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure other departure sid : sid enroute airway : zla |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 250 flight time total : 11000 flight time type : 2500 |
| ASRS Report | 253943 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 250 flight time total : 13000 flight time type : 7000 |
| ASRS Report | 253944 |
| Events | |
| Anomaly | aircraft equipment problem : less severe conflict : airborne less severe non adherence : published procedure non adherence : clearance other anomaly other other spatial deviation |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | aircraft : equipment problem dissipated controller : issued new clearance other |
| Consequence | Other |
| Miss Distance | horizontal : 12000 vertical : 0 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Climbing out from bur on the vny 7 departure, we were given a heading to intercept the pmd 218 degree radial. When the CDI began to move, the captain started his turn to intercept. About the time we thought we should be on the radial, the needles (CDI and VOR) became unsteady and wavering. About that time the lax controller said we were about 3 mi south of course, we had traffic off our right at our altitude and to turn left to avoid if we did not see the traffic. We got a TCASII TA about that time and observed the target 1-2 mi away. We continued our climb, turn for separation and continued the departure without incident. This problem occurred because of an unsteady NAVAID which performed normally for the rest of the flight. No recommendations.
Original NASA ASRS Text
Title: FLC OF AN MLG ACR ACFT DEVIATED FROM ASSIGNED SID TRACK DUE TO FLUCTUATING CDI NEEDLES.
Narrative: CLBING OUT FROM BUR ON THE VNY 7 DEP, WE WERE GIVEN A HDG TO INTERCEPT THE PMD 218 DEG RADIAL. WHEN THE CDI BEGAN TO MOVE, THE CAPT STARTED HIS TURN TO INTERCEPT. ABOUT THE TIME WE THOUGHT WE SHOULD BE ON THE RADIAL, THE NEEDLES (CDI AND VOR) BECAME UNSTEADY AND WAVERING. ABOUT THAT TIME THE LAX CTLR SAID WE WERE ABOUT 3 MI S OF COURSE, WE HAD TFC OFF OUR R AT OUR ALT AND TO TURN L TO AVOID IF WE DID NOT SEE THE TFC. WE GOT A TCASII TA ABOUT THAT TIME AND OBSERVED THE TARGET 1-2 MI AWAY. WE CONTINUED OUR CLB, TURN FOR SEPARATION AND CONTINUED THE DEP WITHOUT INCIDENT. THIS PROB OCCURRED BECAUSE OF AN UNSTEADY NAVAID WHICH PERFORMED NORMALLY FOR THE REST OF THE FLT. NO RECOMMENDATIONS.
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.