A.L.1 PART IV - EMERGENCY HANDLING
(d) Carry out forced landing procedure (see para.94) or abandon.
90. Electrical system failures
(a) Single generator failure
If either generator fails, the output of the other is sufficient for non-
combat flying provided that all non-essential electrical services are off.
When the follow-up tailplane is in use an additional heavy electrical
load is imposed; use of the interconnection should therefore be
limited to flight above 0.9M.
(b) Double generator failure
If both generators fail, all electrical services will be supplied by the
batteries. These, if fully charged, will maintain the following output
before they fail (i.e., battery voltage below 16 volts).
NOTE.-When 2 24-volt batteries are fitted these times should be
To assist the pilot in deciding which loads should be shed, if generator
failure occurs, the following table lists the major services and the
current they require.
NOTE.-The average flight load is 105 amps.
(c) Double generator and battery failure
Once the batteries are discharged, no electrical services can be
operated, e.g., trim tab actuators, tailplane motors, electro-hydraulic
selectors, etc. If the flying controls are in Power, Manual selection
will not be possible unless Mod. 502 is embodied, in which case
Manual may be selected by pressing the emergency selector buttons.
In addition the fuel gauges and electrically-operated flight instru-
ments will become unserviceable. The fuel booster pumps will cease
operation which may entail reduction in altitude and engine r.p.m.
(See para. 57(e).) No relight facilities will be available.
(d) Action in the event of double generator failure
(i) If complete generator failure occurs, switch off all non-essential
electrical services to conserve the battery for as long as possible.
(ii) Switch OFF the tailplane interconnection (when fitted) and set
the tailplane angle to ½° nose-up.
|Booster pumps ..
||Pressure head heater ..
|Radar ranging ..
(relighting) .. ..
|A.C. inverters ..
||Fuel contents gauge ..
|Tailplane actuator ..
||G.G.S. .. .. ..
|Hood control ..
||G.G.S. retraction ..
|VHF sets .. ..
||All other electrics ..
|IFF set .. ..
|D.M.E. .. ..
||Maximum flight load