CESSNA®
MODEL 525B
MAINTENANCE MANUAL
L3HARRIS ELECTRONIC FLIGHT DISPLAY SYSTEM - ADJUSTMENT/TEST
1.
General
A.
This section gives the adjustments and tests necessary for the standby instrument system. For a
general description of the L3Harris Electronic Flight Display System (EFDS), refer to Chapter 34,
L3Harris Electronic Flight Display System - Description and Operation.
2.
Tools and Equipment
A.
For a list of tools and equipment, refer to Navigation - General.
3.
L3Harris Electronic Flight Display System Operational Check
A.
Configure the airplane
(1)
Make sure that the BATTERY switch and the DISPATCH switch are set to the OFF position.
(2)
Disengage the circuit breakers shown in Table 501.
NOTE:
All other circuit breakers are engaged.
Table 501.
Circuit Breaker Positions
Circuit Breaker
Location
L BOOST
Left CB Panel
R BOOST
Left CB Panel
L IGNITION
Left CB Panel
R IGNITION
Left CB Panel
L START
Left CB Panel
R START
Right CB Panel
L PITOT STATIC
Left CB Panel
R PITOT STATIC
Left CB Panel
(3)
Connect external electrical power to the airplane.
(a)
Adjust the electrical power to 28.5 VDC, +0.25 or -0.25 VDC.
(4)
Set the BATTERY switch to the ON position.
B.
Do a Standby Flight Display Battery Pack Operational Check
(1)
If the standby battery was replaced or must be charged, do as follows:
(a)
Let the standby battery charge for at least one hour.
(2)
Disengage the STBY BATT CHARGE (HC020) on the Left Circuit Breaker Panel in the cockpit.
(3)
Hold the STBY FLT DISPLAY switch to the TEST position for 5 seconds.
(a)
Make sure that the green LED light next to it comes on and stays on for the full 5 seconds..
NOTE:
If the light does not come on, or it goes off before the STBY FLT DISPLAY
switch is released, the battery pack must be charged and tested again.
(4)
Set the STBY FLT DISPLAY switch to the ON position.
(a)
Make sure that the amber LED light next to it comes on.
(5)
Set the STBY FLT DISPLAY switch to the OFF position.
(6)
Engage the STBY BATT CHARGE (HC020) on the Left Circuit Breaker Panel in the cockpit.
34-18-00
Page 501
© TEXTRON AVIATION INC.
Feb 23/2022
ICA-525B-34-00004
Form 2261 Rev 1