2.
Leave the engine idling, place the transmission in neutral and set the
parking brake.
3.
Switch ON the MASTER SWITCH. Hold the A-FRAME UP/DOWN switch
UP or DOWN as instructed in step 4 or 5 and to position the A-Frame at
its center position.
4.
To raise the A-Frame, hold the A-FRAME UP/DOWN switch UP. The
A-Frame has rigid “ratchet teeth” welded to the frame which will “ratchet”
past the pivoting A-Frame lock lever during raising. Then the A-Frame
must be lowered down, against the first available ratchet tooth to securely
lock the position during operation.
5.
To lower the A-Frame, momentarily press the A-FRAME UP/DOWN
switch to UP and relieve stair load from the A-Frame lock lever. Then
press the A-FRAME RELEASE switch and hold while pressing the
A-FRAME UP/DOWN switch DOWN. Release the A-FRAME RELEASE
switch and A-FRAME UP/DOWN switch when the A-Frame reaches the
required position.
6.
Hold the STAIR EXTEND/RETRACT switch to the EXTEND position
(This is assuming it is in the full retracted position) and adjust the stair
height to the door sill height to be serviced and consider the following. If
loading the aircraft, the fuselage will lower as much as several inches,
dependent on aircraft; so position the platform far enough below the door
sill that the door will not lower onto the platform and become damaged. If
unloading, the aircraft will rise and it is safe to position the platform “even”
with the door sill, allowing the door to move away from the platform.
7.
The adjustable stair has “stop blocks” welded to the structure which slide
past the pivoting stair lock lever while extending. After extending, the stair
must be retracted against the first available stop block to securely lock
the stair in position during operation. This will also align the steps
properly.
Numbered stop blocks must always rest on stair lock lever.
Failure to do so creates a pinch point between stair steps and risk of serious
injury to feet if stairs drift down to stop block.
8.
As necessary adjust the A-Frame. It allows for fine adjustment of stair
height/door sill adjustment. Be careful when lowering, as the stair will tilt
toward the aircraft and contact/damage could occur. Now the passenger
stair platform should be positioned at the correct service door sill height,
but not be in contact with the aircraft
CHAPTER 1 GENERAL INFORMATION & OPERATION INSTRUCTIONS
SEPTEMBER 30, 2008
2 OPERATION
PAGE 7
Truck Mounted Passenger Stair TMPS-200
Manual No. 307559
