DOCUMENT NUMBER:
L500-912.820 ISSUE JUL 20, 2016
AMENDMENT: 00
DATE: 
CHAPTERPAGE 78
MAINTENANCE MANUAL STEMME S12
7.2.1.3 REINSTALLATION OF THE CANOPY
• Unscrew the ball head bolted joint of the pneumatic springs which hold the canopy open.
• Loosen the M8 nuts on the fuselage side of the canopy hinge by two turns.
• Use a punch to brace the gas spring within the hinge (opening spring) and push the head
half way under the side-wall so that the spring is xed in place. If required, use a wooden
block as support between the bonding seam of the hinge and the lower stationary part of
the fuselage (guide tube).
• Turn the locking lever parallel to the direction of ight (“Unlocked“ position).
•
Two assistants are needed to hold the canopy in the open position and to ensure the precise
position of the hinges one to each other.
• Turn the locking lever through 90 degrees° (as far as the stop); check through inspection
window. Tighten M8 nut.
• Screw the pneumatic springs holding the canopy open back into the ball heads.
• Arm the opening mechanism by inserting a screw driver into the hole provided and press
the gas spring forward until a distinct click is audible.
WARNING
If the gas spring is not initialized as described before, the canopy will not open when releasing
jettisoned in ight.
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