DG Flugzeugbau GmbH
Flight Manual LS 8-18 Emergency
Procedures
3.7 Other Emergencies
3.7.1 Limitation of High Speed Flight
(a) If there are indications, that the intended air speed will be exceeded, for instance
(1)
While flying under large cloudbanks
(2)
During cloud flying
in
heavy turbulence
then:
air brakes should be extended carefully in the green arc airspeed indicator range before
190 km/h (103 Kt.; 118 mph) is reached
Warning: In emergencies, air brakes can also be extended up to a speed of 280 km/h (151 Kt.;
174 mph), however pay attention to the following:
Î
extend air brakes with care
Warning: In this speed range air brakes are sucked open suddenly during unlocking,
resulting in short time negative acceleration, which may support pilot induced
oscillations (P.I.O.).
(b)
once extended, the air brakes can only be fully retracted at speeds below 220 km/h (119 Kt.;
137 mph): spring loaded covers stay open due to aerodynamic suction.
(c) when air brakes are extended during descent
in rough air
(wave flights), a speed of 190 km/h
(103 Kt.; 118 mph) – green ASI range upper limit – should not be exceeded because of possible
severe turbulence.
3.7.2 Rain
During Rain:
(a) expect considerable decrease of performance
(b) increase approach to landing speed by
at least 10 km/h (5 Kt.; 6 mph) above
normal
approach speed, because:
(1) stall speed increases
(2) effectivity of controls decreases
(c) open canopy window to increase visibility
3.7.3 Inadvertent Freezing / Icing
Water ballast in wings and tail fin
Water ballast must be dumped above +5° Centigrade (41° F) outside temperature due to safety
reasons, check with built in thermometer below instrument panel:
(a)
Dumping below 0° Centigrade (32° F), the rear fuselage may collect ice, resulting in
dangerous rearward C.G. displacement
(b)
Additionally, the wing discharge system may freeze on one side only or integral
tanks may be blown up by expansion of ice.
Caution: For prolonged flights below +5° Centigrade (41° F)
use no water ballast.
Icing Conditions
: Move control surfaces continually to avoid freezing solid. Open canopy
window for better visibility.
Edition: Dec. 2001
LBA-appr. Revision – 1 (TB 8011)
Page 3-4