System Maintenance Manual

Page 4-36 G1000/GFC700 System Maintenance Manual – C90A/C90GT/C90GTi King Air
Revision F 190-00682-01
4.14 Nose Avionics Compartment Fans Operational Check
This procedure will verify that airflow is present from the ported avionics cooling fans to the #1 and #2
GIA and GTX units. The fan speed monitoring circuits and annunciations are checked by the G1000
Cooling System Electrical Check in Section 8.1.4 and a Visual Inspection of the fan hoses is
accomplished in Section 4.4. This check requires the G1000 to be powered on.
1. Gain access to the nose avionics compartment.
2. Disconnect cooling fan hose from the pilot side GTX and verify airflow is present.
3. Reconnect the cooling fan hose to the GTX and secure per Nose Bay Electrical Equipment
Install drawing 005-00375-34, Rev 5 or subsequent.
4. Disconnect cooling fan hose from the pilot side GIA GTX and verify airflow is present.
5. Reconnect the cooling fan hose to the GIA and secure per Nose Bay Electrical Equipment
Install drawing 005-00375-34, Rev 5 or subsequent.
6. Repeat Steps 2 through 5 for the copilot side GTX and GIA.
7. The Nose Avionics Compartment Fans Operational Check is complete.
4.15 Instrument Panel Fans Operational Check
This procedure will verify that airflow is present from the PFD1, MFD and PFD2 cooling fans. The fan
speed monitoring circuits and annunciations are checked by the G1000 Cooling System Electrical Check
in Section 8.1.4. This check requires the G1000 to be powered on.
1. Remove PFD1 as described in Section 6.1 Steps 1 and 2 (Removal).
2. Identify the PFD1 cooling fan and verify airflow is present.
3. Reinstall PFD1 as described in Section 6.1 Steps 2 through 4 (Reinstallation).
4. Repeat Steps 1 through 3 for the MFD and PFD2.
5. The Instrument Panel Fans Operational Check is complete.
4.16 Standby Battery Periodic Checks
4.16.1 Charge Check
Refer to the PS-835 Emergency Power Supply Installation Manual listed in Table 1-2.
With the PS-835 battery installed in the aircraft and aircraft power applied, verify all four Battery Voltage
LEDs are lit to indicate the battery is being charged (see Figure 4-7
).
With the PS-835 battery installed in the aircraft and no aircraft power applied, press TEST SWITCH
(Figure 4-7, Item 4) into TEST position for 5 seconds. The PS-835 indicates that it is adequately charged
when the VOLTAGE LEVEL 24Vdc LED (Figure 4-7, Item 2) illuminates momentarily, AND the 20Vdc
LED (Figure 4-7, Item 6) remains lit during the test. If the VOLTAGE LEVEL 24Vdc LED does not, at
least momentarily, illuminate while the 20Vdc LED is illuminated, perform the Section 4.16.3 Cell
Isolation Test because the battery is incapable of providing adequate power.