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Air carrier medium large transport performs an unauthorized takeoff with reduced visibilities. Flight crew had some confusion in the cockpit regarding the authority/authorized takeoff minimums after reviewing their reference cards. 3 RVR values were given but the crew used the higher 2 for takeoff authority/authorized.
| Attributes | |
| ACN | 388670 |
| Time | |
| Date | 199712 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : pit |
| State Reference | PA |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Flight Conditions | IMC |
| Light | Dawn |
| Aircraft 1 | |
| Controlling Facilities | tower : lax |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : takeoff ground : preflight ground other : taxi |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 110 flight time total : 13000 flight time type : 10000 |
| ASRS Report | 388670 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | incursion : runway inflight encounter : weather non adherence : far non adherence : published procedure other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : detected after the fact |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Takeoff minimums confusion. One of the 3 RVR values was given below 600 ft on runway 10C upon checking our 'takeoff minimum cards.' (manual mar 94.) note X manual reads '2 of the 3 RVR reports required.' we interpreted this to mean only 2 RVR reports above 600 ft were required for takeoff. Further investigation revealed our operations specification had been mistakenly removed by revision xx-97. Thus the takeoff minimums card was our only reference.
Original NASA ASRS Text
Title: ACR MLG PERFORMS AN UNAUTH TKOF WITH REDUCED VISIBILITIES. FLC HAD SOME CONFUSION IN THE COCKPIT REGARDING THE AUTH TKOF MINIMUMS AFTER REVIEWING THEIR REF CARDS. 3 RVR VALUES WERE GIVEN BUT THE CREW USED THE HIGHER 2 FOR TKOF AUTH.
Narrative: TKOF MINIMUMS CONFUSION. ONE OF THE 3 RVR VALUES WAS GIVEN BELOW 600 FT ON RWY 10C UPON CHKING OUR 'TKOF MINIMUM CARDS.' (MANUAL MAR 94.) NOTE X MANUAL READS '2 OF THE 3 RVR RPTS REQUIRED.' WE INTERPED THIS TO MEAN ONLY 2 RVR RPTS ABOVE 600 FT WERE REQUIRED FOR TKOF. FURTHER INVESTIGATION REVEALED OUR OPS SPEC HAD BEEN MISTAKENLY REMOVED BY REVISION XX-97. THUS THE TKOF MINIMUMS CARD WAS OUR ONLY REF.
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.