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Flight crew of medium large transport delayed starting #2 engine until cleared for takeoff. Swinging into positing turned on #2 generator. After takeoff noted captain HSI and compass red flagged. Transferred indicators from first officer side, but return landed checked out all instruments and continued flight.
| Attributes | |
| ACN | 178773 |
| Time | |
| Date | 199105 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : iah |
| State Reference | TX |
| Altitude | msl bound lower : 1500 msl bound upper : 1500 |
| Environment | |
| Flight Conditions | Mixed |
| Aircraft 1 | |
| Controlling Facilities | tracon : iah tower : iah artcc : zdc |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | climbout : takeoff climbout : initial landing other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : instrument pilot : flight engineer pilot : commercial |
| Experience | flight time last 90 days : 270 flight time total : 18000 flight time type : 4000 |
| ASRS Report | 178773 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : atp pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : overcame equipment problem other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
Taxied out with #1 engine and gen on (#2 engine shut down, APU off). Awaited takeoff clearance (aircraft heading 180 degrees). Started #2 engine. Cleared to takeoff position (runway heading 090 degrees). While turning onto runway, placed #2 gen on. Cleared for takeoff. Made visibility takeoff. At about 300' started right turn to 240 degrees, transitioned to instruments. Noticed HSI and compass flags, instrument frozen. Compass frozen on 130 degree heading. Flew on standby attitude indicator until able to xfer HSI and compass from first officer side. Returned to airport. Normal approach and landing made. At gate realigned IRS units. Had maintenance check security of iks equipment and electrical connections. Units realigned properly and no further problems.
Original NASA ASRS Text
Title: FLT CREW OF MLG DELAYED STARTING #2 ENGINE UNTIL CLEARED FOR TKOF. SWINGING INTO POSITING TURNED ON #2 GENERATOR. AFTER TKOF NOTED CAPT HSI AND COMPASS RED FLAGGED. TRANSFERRED INDICATORS FROM FO SIDE, BUT RETURN LANDED CHECKED OUT ALL INSTRUMENTS AND CONTINUED FLT.
Narrative: TAXIED OUT WITH #1 ENG AND GEN ON (#2 ENG SHUT DOWN, APU OFF). AWAITED TKOF CLRNC (ACFT HDG 180 DEGS). STARTED #2 ENG. CLRED TO TKOF POS (RWY HDG 090 DEGS). WHILE TURNING ONTO RWY, PLACED #2 GEN ON. CLRED FOR TKOF. MADE VIS TKOF. AT ABOUT 300' STARTED RIGHT TURN TO 240 DEGS, TRANSITIONED TO INSTS. NOTICED HSI AND COMPASS FLAGS, INST FROZEN. COMPASS FROZEN ON 130 DEG HDG. FLEW ON STANDBY ATTITUDE INDICATOR UNTIL ABLE TO XFER HSI AND COMPASS FROM F/O SIDE. RETURNED TO ARPT. NORMAL APCH AND LNDG MADE. AT GATE REALIGNED IRS UNITS. HAD MAINT CHK SECURITY OF IKS EQUIP AND ELECTRICAL CONNECTIONS. UNITS REALIGNED PROPERLY AND NO FURTHER PROBS.
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.