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                            PART I - DESCRIPTIVE
                            
                inertia switches operate, the batteries are automatically
                isolated irrespective of the position of the battery master
                switch.
                     
           (c)  An external ground supply socket is accessible via the
                radio bay door and is for the use when a ground battery is
                necessary for servicing purposes.

           (d)  The table opposite lists the various electrical warning
                lights and indicators in the cockpit.  Failure in any
                circuit (except radar ranging) incorporating a "dolls-
                eye" magnetic indicator is shown by the indicator
                showing white.
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A.L.1           (e)  Emergency battery
Para. 18 (e)
Page 20             An emergency battery is provided to supply the emergency lamps,
                       the Manual emergency selector circuit (Mod. 502) and, when Mod.
                       488 is embodied  the turn and slip indicator.  If fully charged the
                       battery will provide between 7 and 20 hours' continuous use, depend-
                       ing on the load imposed on it.

                  (f)  Instrument supply
                  
                       (i)  The turn and slip indicator is operated by d.c. whenever electrical
                            supply is available.  If electrical supply is lacking the word OFF
                            appears in a window in the face of the instrument.  When Mod.
                            488 is embodied the turn and slip indicator may be operated by
                            the emergency battery after setting on the switch below the
                            instrument.

                       (ii) A.C. for the Mk. 4F compass, artificial horizon, oil pressure
                            gauge and GGS radar ranging is supplied by two inverters.  No. 1
                            inverter normally supplies the flight instruments and No. 2
                            inverter normally supplies the radar ranging.  The engine starter
                            master switch controls the circuit to No. 2 inverter.  No. 1 inverter
                            is brought into circuit when the undercarriage is not locked
                            down.  During taxying and take-off the a.c. supply is from No. 2
                            inverter.
                            
                            The RADAR TEST switch (8) may be used to test the inverters
                            before flight (see para. 61).
                       
                       (iii)If No. 1 inverter fails in flight, automatic changeover occurs,
                            and No. 2 inverter then supplies the flight instruments, the load
                            to the radar ranging equipment, if in use, being shed.

                       (iv) Located on top of the a.c. junction box at the aft end of the
                            starboard shelf, are two circuit breakers (one for each inverter
                            supply), a magnetic indicator (which gives indication of inverter
                            changeover) and a STANDBY TESTING/NORMAL FLIGHT
                            switch (for servicing purposes only).  This latter switch should
                            always be set to NORMAL FLIGHT (inboard).  In flight none
                            of these is visible or accessible.

20

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