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Warning horn distraction, PF gets 1 DOT up on GS and 10 KTS fast on CAT III approach. HUD test indicates ok.
| Attributes | |
| ACN | 223355 |
| Time | |
| Date | 199210 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : anc |
| State Reference | AK |
| Altitude | agl bound lower : 0 agl bound upper : 1000 |
| Environment | |
| Flight Conditions | Marginal |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | tower : anc |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | descent : approach landing other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 6250 flight time type : 4750 |
| ASRS Report | 223355 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : atp pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : less severe |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : overcame equipment problem |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
During practice CAT III approach to anc runway 6R using HUD, with FAA occupying the jumpseat. At 1000 ft AGL with gear down, flaps 30 (final flaps), when arming speed brake for automatic deploy upon landing, got warning horn. Stowed speed brake (full forward with speed brake and light extinguished), warning horn stopped. Tried once more to arm speed brake with same results. Because of distraction went 1 DOT above on GS and plus 10 KTS fast. But HUD still did a self test at 1000 ft AGL and passed CAT III. At 500 ft AGL HUD goes more sensitive and I was on GS but still 10 KTS fast so got 'approach warn' symbol on HUD. By 400 ft AGL, all was within parameters and CAT III all the way to touchdown, rollout. I elected to continue CAT III with 'approach warn' at 500 ft because I had field in sight, and wanted to see if I could get back to the perfect approach. On touchdown at 1800 ft down runway, on centerline, everything was ok with thrust reversers deployed (at 1.4 - 1.5 EPR). The aircraft jogged left abruptly at 100 ft, reversers stowed and aircraft handled properly. Reversers engaged 3 more times to test (I wasn't sure they were what caused the drift left) and aircraft handled normally! So the jog/drift was caused by ?? (Ice/wind)? On arrival at gate, speed brake warning horn was written up in maintenance log. FAA jumpseater deplane with 'nothing for us.'
Original NASA ASRS Text
Title: WARNING HORN DISTR, PF GETS 1 DOT UP ON GS AND 10 KTS FAST ON CAT III APCH. HUD TEST INDICATES OK.
Narrative: DURING PRACTICE CAT III APCH TO ANC RWY 6R USING HUD, WITH FAA OCCUPYING THE JUMPSEAT. AT 1000 FT AGL WITH GEAR DOWN, FLAPS 30 (FINAL FLAPS), WHEN ARMING SPD BRAKE FOR AUTO DEPLOY UPON LNDG, GOT WARNING HORN. STOWED SPD BRAKE (FULL FORWARD WITH SPD BRAKE AND LIGHT EXTINGUISHED), WARNING HORN STOPPED. TRIED ONCE MORE TO ARM SPD BRAKE WITH SAME RESULTS. BECAUSE OF DISTR WENT 1 DOT ABOVE ON GS AND PLUS 10 KTS FAST. BUT HUD STILL DID A SELF TEST AT 1000 FT AGL AND PASSED CAT III. AT 500 FT AGL HUD GOES MORE SENSITIVE AND I WAS ON GS BUT STILL 10 KTS FAST SO GOT 'APCH WARN' SYMBOL ON HUD. BY 400 FT AGL, ALL WAS WITHIN PARAMETERS AND CAT III ALL THE WAY TO TOUCHDOWN, ROLLOUT. I ELECTED TO CONTINUE CAT III WITH 'APCH WARN' AT 500 FT BECAUSE I HAD FIELD IN SIGHT, AND WANTED TO SEE IF I COULD GET BACK TO THE PERFECT APCH. ON TOUCHDOWN AT 1800 FT DOWN RWY, ON CTRLINE, EVERYTHING WAS OK WITH THRUST REVERSERS DEPLOYED (AT 1.4 - 1.5 EPR). THE ACFT JOGGED L ABRUPTLY AT 100 FT, REVERSERS STOWED AND ACFT HANDLED PROPERLY. REVERSERS ENGAGED 3 MORE TIMES TO TEST (I WASN'T SURE THEY WERE WHAT CAUSED THE DRIFT L) AND ACFT HANDLED NORMALLY! SO THE JOG/DRIFT WAS CAUSED BY ?? (ICE/WIND)? ON ARR AT GATE, SPD BRAKE WARNING HORN WAS WRITTEN UP IN MAINT LOG. FAA JUMPSEATER DEPLANE WITH 'NOTHING FOR US.'
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.