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The canopy has a tubular rubber seal. The seal goes round the edge of the canopy frame.
When the canopy is closed the seal touches cockpit sill.
B. Canopy Hinges
The canopy attaches to the fuselage with three hinges. One hinge at the back of the canopy and
one at each side. A large spring attaches between each side arm and the rear fuselage. The
springs help balance the weight of the canopy.
C. Canopy Locking
A latch mechanism attaches to each side of the canopy. There are two possible configurations
of these latches. On older aircraft, there are latch handles on the inside of the canopy only.
Newer aircraft have handles on the outside of the canopy in addition to the internal ones.
The latches with internal handles only are constructed as follows (See Figure 2). Two steel
plates make the body of the latch assembly with aluminum spacers between them. The inboard
plate attaches to the canopy frame by four stainless steel screws. One of the aluminum spacers
between the plates makes a stop for the canopy handle. Each latch mechanism has a red
painted grip that attaches to a steel plate, which serves as the handle and the hook. The hook
has a steel boss with an internal PTFE (Teflon) lined plain bearing. The hook turns around an
internally threaded steel shaft welded to the outboard side plate. The shaft goes into a
clearance hole in the inboard side plate. Also on the shaft are conical washers that provide
friction. A steel screw compresses the conical washers so that the friction can be adjusted to
obtain the correct latching force.
The latches with external handles are constructed as follows (See Figure 3). The single steel
plate is attached to the canopy frame by four steel screws and separated from the frame by two
steel shims and an FRP spacer at each end. The shaft of the external handle is inserted into a
bushing permanently installed in the steel plate. The shaft has an “O”-ring seal that provides
friction. The friction is not adjustable on aircraft with outside handles. The internal handle/hook
is fastened to the external handle via three screws. A screw to limit the travel of the mechanism
is also fastened to the steel plate.
A strike bearing attaches to each side of the fuselage next to the canopy rail. A ball bearing that
turns on a stainless steel shaft makes the strike bearing. The strike bearing attaches to an
Doors
DA20-C1 AMM
Page 4
29 Apr 2004 52-10-00 Doc # DA201-C1
Rev. 9
aluminum block. The aluminum block attaches to the underside of the fuselage at the canopy
rail. A micro-switch with a roller lever goes behind the bearing. The micro-switch will only
operate when the hook completely engages the strike bearing.
The part of the hook that engages the strike bearing is shaped with a small ramp that ends to
make a recess. As the grip is pushed forwards, the canopy is pulled downwards to compress
the canopy seal. When the bearing drops into the recess the canopy is locked. The force
necessary to open the canopy from this position will stop accidental operation. If the electrical
power is set to on and both latches are not engaged, the red warning light on the instrument
panel will come on.
D. Alignment Pins
A conical pin on each side of the canopy at the rear aligns the canopy when it is closed. The
pins engage with conical alignment holes in the bottom of the canopy frame.
3. Operation
With the canopy lock set to open, the hook moves forwards and disengages the strike bearing. The
canopy can move up. You can access the canopy lock grips through the canopy sliding side
windows externally.
A. Canopy Closed
These actions lock the canopy closed:
− Move the canopy fully down.
− Move both grips to the CLOSED position. (Both internal grips fully forward)
− The hook goes to the rear. It fully engages the strike bearing. It also operates the microswitch.
This pulls the canopy against the seals.
B. Canopy Open
These actions unlock the canopy:
− Move both grips to the OPEN position. (Both internal grips to the rear/aft)
− The hook moves forwards and disengages the strike bearing.
− Push the canopy up.
DA20-C1 AMM
Doors
Doc # DA201-C1
Rev. 0 52-10-00 Page 101
19 Dec 1997
TROUBLE-SHOOTING
1. General
The table below lists the defects you could have with the canopy. If you have the trouble detailed in
the Trouble column read across to the Possible Cause column. Then do the repair in the Repair
column.
Trouble Possible Cause Repair
Canopy is difficult to move. Canopy frame damaged. Replace the canopy.
Canopy unlock/lock grips
difficult to move.
Latch mechanism out of
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钻石20系列AMM 2(47)
