Maintenance Manual STEMME S10-VT
Date of Issue: Jan. 01, 1998
Page 7-27
Amendment Nr. 0
Date: --
A4011121_B23.doc
Doc. No. A40-11-121
7.5.1.2 Functional Test of the Retractable Landing Gear:
Support the aircraft (clearance between the main wheels and the ground must be approximately 40 mm /
1.6 in.), remove upper cowling of the central fuselage.
Checking procedure:
Inspect screw joints (torque paint)
check wheels for smooth turning
joint heads of the elbow levers should not be jammed
the articulations of the spindles and the elbow levers must have play
installation of the landing gear emergency release system without kinks/collisions
landing gear stop switches on the elbow levers: check for halfway position and proper functioning, inspect
wiring / connection
retraction of left landing gear leg:
Check if the landing gear contacts surrounding components
Brake hose must have regular bends, must not jam
Check of stop switch adjustment: 2 - 5 mm / 0.08 to 0.2 in. clearance between the landing gear leg and
the shaft housing
The stop switch must be positioned in the middle of the landing gear strut
Joint heads of the elbow lever must not be jammed
Articulation between the spindle and the elbow lever must not jam
extension of left landing gear leg: check if the elbow lever returns to its correct over-centre-locked
position, if necessary adjust the switch
retraction of right landing gear leg:
(independent from the left leg - for this purpose, first actuate left stop switch "retracted", then disconnect
the arm linking the operating cable to the left LG door - take care that the cable and arm do not jam as the
right leg is retracted)
Check if the leg contacts surrounding components
Brake hose must have regular bends, must not jam
The stop switch must contact the centre of the landing gear tube
Joint heads of the operating elbow lever must not be jammed
Articulation between the spindle and the operating elbow lever must not jam
extension of right landing gear leg:
check for correctly over-centre-locked position of the operating elbow lever
retraction of both landing gear legs:
Collision check
Align stop switch on the right landing gear leg for a clearance of 2 - 3 mm / 0.08 to 0.12 in. between
both gear legs
check of landing gear doors (first connect left LG door):
Smooth operation of gear doors
Fit of gear doors
Positive clearance between gear doors and wheels
retract landing gear with the upper cowling of the central fuselage mounted:
Check clearance between the drive spindles and the cowling
the bowden cables of the emergency release system may not be buckled or get stuck
test of complete system: retract and extend the landing gear three times with intermediate checks each
time:
inspect supports of switches
inspect switches (attachment), damage
listen to spindle motor noise
if necessary, adjust brake bands
look out for chafe spots on the brake hoses
check for stress-strain loads acting on the wiring
check position indication (LED's on instrument panel: two greens when extended, red flashing during
operation, off when fully retracted) and acoustic warning (if L/G not fully extended and air brake lever in
rear, unlocked positions)
