C 9/2003 L
Airliner landing with low fuel at Helsinki-Vantaa airport on 3.10.2003
35
4 RECOMMENDATIONS
The flight SK946 used fuel during flight from the missed approach in Arlanda to landing
in Helsinki-Vantaa 4300 kg when the calculated fuel consumption was 3700 kg. The fuel
consumption was about 16% higher than calculated in the Operational Flight Plan of
Scandinavian Airlines. The flown missed approach departure route in the destination
airport was not the one giving the longest distance and the approach in alternate airport
was not made to the least favourable runway as it is stated in the bases of the calculations
in the RODOS Planning system description.
1. Scandinavian Airlines should check the alternate fuel calculation basis used in the
operational flight plans of the airline.
In the fuel calculation basis of RODOS Planning - Longhaul Aircraft is described the
flight path from a point 30 NM distance to the threshold of the landing runway and also
diversion. The calculated flight time from 30 NM to the threshold is 12 minutes and the
approach fuel 600 kg. In the OFP of SK946 was printed the remaining flight time of 12
minutes and the remaining distance of 30 NM from the point of ELTOK. SK946 flew from
ELTOK to missed approach point 20 minutes and about 65 NM and used fuel 1100 kg. It
is in the RODOS calculations assumed that the approach is flown aircraft in clean configuration
to 10 NM from the threshold and after that point in landing configuration. In
heavy traffic and in low visibility conditions the traffic slows down and the approaching
aircraft are forced to use high lift devices before 10 NM from the threshold which increases
the fuel consumption considerably. In these conditions also the flown approach
tracks become longer which increases the approach time and fuel consumption.
2. Scandinavian Airlines should draw the attention of their flight crews to the bases
how the approach fuel is calculated by the RODOS Planning system. The commanders
should be recommended to take extra fuel for possible approach delay
caused by the weather conditions and/or intense traffic.
The investigators had available copies of the used master Operational Flight Plans from
34 flights from Chicago to Arlanda between 8.9.2003 and 15.10.2003 operated with
A330. The total fuel consumption or the remaining block fuel was not marked in any of
these master copies. The last fuel check was marked 45 min to 2 h 32 min before landing.
To fulfil the meaning to afterwards verify the progress of the flight, the fuel checks
should be marked until the top of descent. The total fuel consumption should also be
possible to verify.
3. Scandinavian Airlines should order the flight crews to make the fuel checks also on
the last part of the flight and enter the checks in the Operational Flight Plan. Also the
checks and markings of the remaining block fuel or the total consumed fuel should
be done appropriately.
Helsinki, 3.6.2004
Jussi Haila Antti Ruuth
37
APPENDIX 1
38
t h e i d e a o f f l i g h t
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