JS-MD 3
Aircraft Flight Manual
MD10-AFM-00-001
Issue: 01
Rev. 00
Rev. Date: 14-Feb-20
Page 4-27
4.5.7.2
Dumping procedure
1. Open the valves by shifting the dump valve lever forward and
down. The combined dump rate of the main tanks is
approximately 50 litres per minute. The dump rate will slow down
when approximately 20 % of water is left.
2. Visually check if water is dumping from both wings (the water
trails can be seen below the wings near the fuselage, and at the
tips in the 18 m configuration). In the event that any of the valves
are not dumping, the valves must be closed immediately to
prevent an asymmetric water ballast load condition.
3. To dump the ballast only partially, the inboard wings must be
dumped first. This is achieved by moving the damp valve lever
to the centre position.
4. If progressively increased aileron deflection is required to
maintain bank angle while dumping water, the water is probably
dumping unevenly. Refer to Section 3.11.2 for details on
asymmetrical flight procedures.
5. If more nose-down trim is required after dumping water ballast,
it is likely that the expendable tail water ballast has not been
dumped. In this case avoid flying at speeds near the stall.
6. Allow sufficient time to completely dump all water before landing.
(Approximately five minutes is required.)
NOTE:
Increase tyre pressure up to 3.5 bar (or 50.8 psi) when
flying fully loaded in the 18 m configuration.
CAUTION:
Use clean water without any additives to avoid damage
to the inner water ballast structures and rubber seals.
