System Maintenance Manual

Page 6-14 G1000/GFC700 System Maintenance Manual – C90A/C90GT/C90GTi King Air
Revision G 190-00682-01
6.21 Instrument Panel Annunciators (Prop Synch and Standby Battery)
Removal:
1. Remove MFD from the instrument panel as per Section 6.1.
2. Using a M22885/108T8234 extraction tool, disconnect connector from the back of the switch.
3. Pull the pushbutton cap fully out of the switch body and allow the cap to rotate 90° where it is
held by the retaining element.
4. While holding the retaining sleeve (back side of the instrument panel), loosen the two screws
inside the switch body until the switch is free to come out.
5. Remove the mounting sleeve and switch from the instrument panel.
Reinstallation:
1. Reinstallation of the Prop Synch and Standby Battery switches is the reverse of the removal.
Reference the Main Instrument Panel Installation drawing, listed in Table 1-2, for more details.
2. Press and hold the cockpit annunciator “Press To Test” switch located to the left of the
annunciator panel, and verify the following:
a. For the Standby Battery Annunciator/Switch: STBY Battery Switch legends illuminates
and reflects “STANDBY BATTERY” in white, “ARM” in green, and “ON” in amber.
b. For the Prop Synch Annunciator/Switch: Prop Synch Switch legends illuminates and
reflects “PROP SYNC” in white, and “ON” in green.
6. Release cockpit annunciator “Press To Test” switch.
7. If further maintenance is not required, proceed to Section 8.
6.22 L-3 Avionics (BF Goodrich) PS-835(C or D Model) Emergency Battery
NOTE
The emergency battery was added by this STC (in the nose equipment compartment) for aircraft that did
not have a pre-existing factory installation (typically located in the tail). For aircraft with the factory
installation, refer to the King Air Model 90 Series Maintenance Manual, listed in Table 1-2, for removal
and replacement information.
Removal:
1. Unscrew the knurled hold-down nut to allow it to move free of the unit.
2. Remove the unit from the rack.
Reinstallation:
1. Install the emergency battery in accordance with the standby battery installation drawing (refer to
Master Drawing List, listed in Table 1-2, for specific drawing number). Refer to the King Air
Model 90 Series Maintenance Manual, listed in Table 1-2, for access requirements as needed.
For aircraft which the standby battery was installed by this STC, the maintenance will be as per
the King Air manual but the access will be through the nose avionics compartment.
2. If further maintenance is not required, proceed to Section 8.