350,475. Air brakes for aeroplanes. GRAY, W. E., 8A, Bank Parade, Edgware, Middlesex. March 6, 1930, No. 7408. [Class 4.] An aeroplane which is provided with one or more parachutes which can be released to act as air brakes has one parachute 4, Fig. 2, attached by two separate means, the normal one 5 which operates when the parachute is expanded, and a second one 6 which attaches the parachute to the aeroplane in an unexpanded state. Means are provided for successively increasing the lengths of the lines 5, 6 thus rendering the parachute alternately operative and inoperative. A small parachute may be provided to reduce the rate of descent and may be arranged to draw a larger one from its container to reduce the landing run, a third parachute 10, Fig. 2, may be employed to keep the " inoperative " line 6 in tension.; Parachute 4 is housed in the wing, Fig. 1, in a recess normally closed by a panel 2. The attaching lines 5, 6 are secured to the lengthening mechanism 7 disposed on the centre line of the machine. The cables 5, 6 are attached to a fitting 11, Figs. 3 and 4, by pins 12, 19 respectively. Withdrawal of these pins by a hand-wheel 13 allows of extra coils of cable to be added in turn to each attaching line. The operative cable 5 may on final release withdraw a large parachute; where none is fitted the parachute is finally attached in the inoperative state. Hand-wheel 13 is fitted with a ratchet. According to modifications the parachutes may be housed in the rear of the fuselage or in the fin and the lengthening mechanism may be operable from a distance through cables.