Operation - Diamond DA20-C1 Maintenance Manual

Doors
The latches with external handles are constructed as follows (Refer to Figure 202):
- 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
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
micro-switch. 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.
Page 2
30 Oct 09
52-10-00
DA20-C1 AMM
DA201-C1
Rev 16