PART 1II-HANDLING
63. Spinning
(a) Practice spinning is permitted only with the clean aircraft,
or with the ventral tank fitted but empty. The spin should
not be entered below 25,000 feet and recovery action must
be taken before the end of the second turn. Entry may be
either from a straight stall or from a turn. Airbrakes have
little effect on the spin but, if used, should be left out until
recovery is complete.
(b) The aircraft will normally enter the spin by first rolling
on to its back and then dropping its nose. Behaviour in the
spin varies widely between aircraft and between spins on
the same aircraft. Pitching, changes in rate of rotation,
and snatching of the control column from side to side are
characteristics which can occur to a varying degree in
various spins. Except in isolated cases, however, the con-
trol column will snatch over to the inside of the spin.
(c) Normal recovery action is effective but should be taken
while the aircraft is inverted at the beginning of the spin.
Prior to recovery, speeding up of rotation and steepening
of attitude may be experienced. Heavy control forces must
be expected; a two-handed force will normally be required
to centralise the control column. Unless the controls are
centralised promptly there is a danger of spinning in the
opposite direction after the rotation has ceased.
64. High-speed/flying
(a) The high mach number characteristics vary between indi-
vidual aircraft and, generally speaking, become worse with
age and deterioration of the external finish. The investiga-
tion of an aircraft's performance should be carried out
progressively until its high-speed characteristics are estab-
lished and the limitations quoted in para. 46 must not be
exceeded intentionally.
(b) Clean or with belly tank
(i) Above 20,000 feet, there is a progressively strong
nose-up trim change as speed is increased; elevator
trim may be used to counteract this tendency up to
0.76M, after which the trimmer must not be used.
Slight buffeting may occur between 0.76M and the
speed limitation of 0.78M and, if the latter speed is
inadvertently exceeded in a shallow dive, a heavy47
|
