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ELECTRICAL
RAT GEN FEED
Emergency AC power is supplied by the ram air turbine (RAT) in flight, rated at 115volts, 9 kVA, 3.phase. With a dual.engine failure, the RAT will deploy automatically, regardless of slat/flap handle position. The RAT can also be manually deployed by pulling RAT manual deploy handle, located on the center pedestal.
With engines running, the RAT will deploy with a 14.second time delay following the loss of all AC power, if the slat/flap handle is at the in/zero position. And if the flaps/slats are deployed, with a loss of all AC power, the RAT will deploy immediately and will supply power to AC ESS within 6 seconds of deployment.
The RAT will supply power to AC ESS within 6 seconds of deployment. This delay is implemented to allow the pilot to regain GEN 1.2.3 or 4 or APU GEN power.
In the event that an operating generator is restored, select the RAT GEN switch to OFF with the RAT manual deploy handle in the stowed position. The RAT GEN will remain in a standby mode.
Rev 3, Apr 25, 2005 Flight Crew Operating Manual Volume 2
ELECTRICAL
RAT GEN FEED (CONT'D)
GF0710_051a
Volume 2 Flight Crew Operating Manual Rev 3, Apr 25, 2005
07.10.36 CSP 700.5000.6
ELECTRICAL
RAT PILOT ACTIVATED TEST
The pilot activated test is initiated by the pilot during pre-flight after AC power has been applied to the airplane. It takes approximately 5 seconds to complete the test. The test is activated through the EMS CDU on the ground only.
RAT TEST:
Press the RAT TEST activation button to initiate test. Test duration is approximately 5 seconds.
GF0710_052
The pilot activated test checks the following:
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The RAT line contactor,
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the 147 KIAS discrete signal from the MADCs
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the RAT GCU,
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the RAT deploy handle status signal,
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AC bus 4 status signal,
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the RAT GEN push button annunciator status,
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the RAT generator heater. A failed test results in a RAT GEN FAIL caution message being posted on the EICAS status page.
Rev 3, Apr 25, 2005 Flight Crew Operating Manual Volume 2
ELECTRICAL
EMERGENCY DC POWER
In the event of loss of all AC power , or the airplane speed is 147 knots or less with the RAT deployed, a “BATTERY EMER PWR ON”EICAS message will be displayed. This message will be displayed when the airplane is operating on emergency battery power only.
If the RAT is deployed and speed is less than 147 knots, it will automatically shed its electrical output giving priority to hydraulics.
NOTE
Battery emergency power is available for a minimum of 15 minutes.
GF0710_053
Volume 2 Flight Crew Operating Manual Rev 3, Apr 25, 2005
ELECTRICAL
DC POWER EMERGENCY OVERRIDE
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