PART III - HANDLING
(v) At low altitudes max. power can be obtained within
5 secs. if r.p.m. are above a minimum of 4,500 and
at high altitudes within about 10 secs from
59. Management of the engine anti-icing system
(a) With the system in use, all throttle movements must be
made smoothly. There is a loss of thrust and fuel
economy and j.p.t. usually rises by about 20°C. At full
throttle, r.p.m. may then fall if the top temperature
control comes into operation.
(b) Level flight
If icing conditions are met in flight, climb or
descend out of the icing level (see (c) and (d) below).
Open up to not less than 7,200 r.p.m. and set the anti-
icing switch to OPEN. Climb at the maximum practic-
Throttle back to not less than 5,500 r.p.m. and set the
switch to OPEN. Descend at the maximum practicable
rate; maximum anti-icing protection is obtained at the
highest practicable r.p.m.
(e) When clear of icing conditions, set the switch to SHUT
and wait for about 10 seconds before making any rapid
throttle movements. If icing conditions persist down to
airfield level keep the switch at OPEN and maintain
engine speed above 5,500 r.p.m. until finally committed
to a landing.
60. Management of the flood flow system
For all normal conditions of flight the FLOOD AIR-
FLOW CONTROL switch should be at AUTO. To
prevent windscreen misting MANUAL should be selected
wherever necessary. During take-off the increase in air-
flow is considerable.
61. Testing A.C. inverters on the ground
(a) To test No. 2 inverter first check that the inverter circuit
breakers are in, then set the battery master switch ON,