PART III - HANDLING
A.L.2
Page 72(g)  Outboard stores seriously affect the stall characteristics, particularly
                 the time taken for recovery after initiating recovery action. This
                 feature is aggravated if inboard stores are also carried.
             

        73.   High speed stalling
        
        (a)    (i)   High speed stalling is subject to the overriding restriction of
                       para. 56 whereby pilots must not exceed +7G.

               (ii)   At airspeeds above 0.9M between 10,000 and 30,000 feet, unless
                      Mod. 533 is fitted, an accelerometer reading +4G must not be
                      exceeded. At airspeeds below 0.9M in that height band, G must
                      not be applied beyond the buffet stage.

        (b)   Pitch-up (Pre-extended wing leading edges)
        
                 (i)   During turns and pull-outs adequate stall warning is given by
                       buffeting at all heights. If the backward pressure is continued
                       inadvertently after the stall warning, wing drop or a momentary
                       pitch-up and sudden increase in G may occur.
                       
                 (ii)  Below 10,000 ft. the maximum acceleration of +7G may be
                       applied at the higher mach numbers without stalling the air-
                       craft; no pitch-up is therefore experienced.

                 (iii) Between 10,000 ft. and 30,000 ft. at speeds above 0.9M the
                       pitch-up, if experienced, may be coincidental with the buffeting
                       and may be severe enough to exceed +7G. It is for this reason
                       that the restriction of +4G accelerometer reading is imposed.
                       
                 (iv)  Above 30,000 ft. it is not possible to achieve high accelerometer
                       readings, although pitch-up is still experienced.
                       
        (c)    Pitch-up (Extended wing leading edges fitted)
        
                When Mod. 533 is embodied the tendency to pitch-up is reduced and
                the G limitations(accelerometer readings) are +7G and -3¾G at
                all heights and speeds. Pitch-up may still occur to a reduced degree
                when G is applied, at speeds above 0.9M in the height band 25,000
                ft. to 30,000 ft. If pitch-up occurs it is still possible to maintain some
                degree of longitudinal control. Buffeting is considerable and wing
                dropping may occur.

        (d)    Jack stalling
        
               Buffeting and/or limiting G can be obtained with little effort, par-
               ticularly when ammunition is not carried, but if jack stalling occurs
               it reduces the amount of G it is possible to obtain. If the stick is held
               hard on the restriction stop an increase in G must be anticipated if
               speed is decreased, because the jack unstalls and further stick move-
               ment becomes possible as airspeed decreases. The increase in G will
               be sudden if the jack unstalling is coincidental with the nose-up
               change of trim as speed falls through 0.95M. When manoeuvring at
               high I.A.S. near the ground, sufficient height must be allowed for a
               recovery to be effected in the jack stalled condition using the V.I.
               tailplane.  Care should be taken when manoeuvring at high mach
               numbers as it is easy to pull into the pitch-up inadvertently due to
               the light stick force.

72