A.P. 2210G.-P.N.
							Pilots's Notes
							

			        PART II

			    LIMITATIONS

    45.  Engine data -Derwent 8 and 9

         The principal engine limitations are as follows:-
         




		
Power
rating
	
		
Time
limit
		
Maximum
permissible
r.p.m.
	
		
Maximum
permissible
j.p.t. (°C)



		
Take-off
climbing and
operational
necessity
		
15 mins
		
14,700 ±100*
	
		
680
(700 above 20,000 ft
for ten minutes)



		
Maximum
continuous
	
		
No limit
		
14,100
	
		
630



		
Idling on
ground
(throttle closed)
	
		
No limit
		
3,300-3,700
	
		
500




* A governor on the engine-driven fuel pump restricts the r.p.m. to 14,500
at sea level but with the throttle fully open r.p.m. may increase progressively
to 14,700 with height.

         Oil pressures

         Minimum for idling	...	...	...	 5 lb./sq, in.
         Minimum at 14,100 r.p.m. and above	...	30 lb./sq, in.

    46.  Flying limitations

    (a)  The aircraft is designed for the duties of an advanced
         fighter trainer.  Practice spinning up to two turns is per-
         mitted when the aircraft is clean, or when the ventral tank
         is fitted but empty (see para.63).  Maximum rate turns and
         other manoeuvres involving high G are prohibited when
         there is fuel in the ventral tank.
    
         WARNING.-It is possible to cause excessive G loading
                  by flying the aircraft out of trim.

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