CESSNA®
MODEL 525B
MAINTENANCE MANUAL
Letter
Note
EE
Flood lights on only during start, and when specifically turned on by the crew.
FF
Both the 500 Watt use the same control circuit breaker.
GG
500 Watt & 1200 Watt Inverters are mutually exclusive. 1200 Watt inverter
is used in totals.
HH
Anti-skid control box. Operational only with gear extended.
II
For Taxi; P/S System Limited Per Note S, 4 Minutes of Operation is used, 2
minutes of t 2 minutes prior to takeoff.
JJ
Speedbrake PCB Power is dual sourced, speed brake C/B is used for power
on load analysis.
KK
Landing Gear 1 PCB, Landing Gear 2 PCB, and Landing Gear Monitor PCB are
all dual power sourced. For load analysis purposes, Landing Gear 1 PCB and
Landing Gear 2 PCB are powered from the Gear Control C/B and Landing Gear
Monitor PCB is powered from Gear Monitor C/B.
LL
Two ignitor boxes per engine. Ignitor box power is controlled by the FADEC.
When ignitor switch is in AUTO, one or both ignitor boxes may be activated
depended upon the FADEC. Both ignitor boxes are powered when ignitor
switch is in manual.
MM
Ground dispatch C/B's provide alternate hot power source for COMM 1, RTU
1, ACP 1, and ACP 2; Only when Master Switch is OFF and Ground Dispatch
Switch is ON.
NN
Fuel flow PCB is a Dual Channel Card. Each Channel is powered by a
LM317AT Voltage regulator with a 1 amp capacity.
OO
Roll and Yaw servos operate 8% of the time.
PP
Pitch servo operates twice as much as roll; 16% of time.
Max cool solenoid only ON when A/C compressor is ON.
RR
All interior Bus Current Values are for C/B size regardless of actual load drawn.
SS
Average Battery Charge.
TT
The MFD GDU contains the optional FS510 accessory which draws a Max
of 0.050 A, Which is supplied by the GDU and included in the GDU current
Consumption.
UU
The Hydraulic Loading Valve time on is dependet on the phase of flight. Dual
GEN Taxi is 3 minutes, Dual Gen Takeoff is 2 minutes, Single GEN landing is 2
minutes, and Emergency is 2 minutes.
24-55-01
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© TEXTRON AVIATION INC.
Feb 23/2022
ICA-525B-34-00004
Form 2261 Rev 1