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WARNING: KEEP PERSONS AND EQUIPMENT AWAY FROM THE WHEEL WELL AREAS WHEN YOU MOVE THE ALTN GEAR EXTEND SWITCH TO OPEN THE GEAR DOOR(S). THE DOOR(S) OPEN AND CLOSE QUICKLY AND CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 Verify the ALTN GEAR EXTEND switch operates normally as follows:
WARNING: KEEP PERSONS AND EQUIPMENT AWAY FROM THE WHEEL WELL AREAS WHEN YOU MOVE THE ALTN GEAR EXTEND SWITCH TO OPEN THE GEAR DOOR(S). THE DOOR(S) OPEN AND CLOSE QUICKLY AND CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 Close the gears doors.
 Move the ALTN GEAR EXTEND switch to the down position.
 Verify the gear doors open.
 Return the airplane to normal configuration.
 
REPAIR INTERVAL C 1 NUMBER INSTALLED
ITEM   0 NUMBER REQUIRED FOR DISPATCH
    REMARKS OR EXCEPTIONS
(M) (O) May be inoperative provided:
 Inoperative components are properly secured by an accepted procedure, and
 Airplane is dispatched in accordance with QRH Gear Down Operations.
32-30-1 Landing Gear Retracting
System    

EICAS STATUS MESSAGES
None
PLACARD
Landing gear lever - LANDING GEAR LOCKED DOWN
MAINTENANCE (M)
1. Install the landing gear downlock pins in the main and nose gear as follows.
WARNING: MAKE SURE THAT THE MAIN GEAR DOORS CAN NOT OPEN INTO PERSONS OR EQUIPMENT. DOORS OPEN QUICKLY AND CAN CAUSE INJURY OR DAMAGE.
 Install landing gear door locks (AMM 32-00-15).
 Put the landing gear control lever in the DN position.
 Use the downlock removal/installation tool to install the downlocks on the main landing gear (2 locations). Refer to AMM 32-00-20 task 32-00-20-002-001 Landing Gear Downlocks Maintenance Practices.
 Use the downlock removal/installation tool to install the downlocks on the nose landing gear. Refer to AMM 32-00-20 task 32-00-20-002-001 Landing Gear Downlocks Maintenance Practices.
 Return the landing gear door locks to the normal condition.
2. Open and collar the Landing Gear Lever Lock circuit breaker prior to flight to prevent inadvertent gear lever movement to the up position.
3. Select the ALTN position (switch pushed up) on the ALTERNATE Vmo/Mmo switch S10471 on the EE Bay Service Panel. This provides gear down Vmo/Mmo data for display on airspeed indicators and causes the aural warning siren, red WARNING master warning lights on the glareshield, and the RED OVSPD warning light on the captain's panel to come on, and OVERSPEED warning on EICAS to appear when the gear down Vmo/Mmo is exceeded.
OPERATIONS (O)
 Ensure the airplane is dispatched in accordance QRH Gear Down Operations.
 Base flight plan on landing gear extended.
 
 The ALT Vmo/Mmo switch to the Air Data Computer has been set to provide gear down Vmo/Mmo data for display on airspeed indicators. The aural warning, red warning lights on the glareshield, and the RED OVSPD warning light on the captain's panel will come on when the gear down Vmo/Mmo is exceeded.
　
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