P-3C Flight Instruments

Front 1

IFF transponder power source and location

Back 1

FEAC / MEDC
FEDC backup when switch is held in backup position

H rack

Front 2

purpose of IFF BAT PWR switch

Back 2

hold it on to provide FEDC power instead of MEDC to the IFF (FEAC must be powered)

Front 3

rate of turn control power source and location

Back 3

MEAC

C rack

Front 4

standby gyro power source and location

Back 4

MEAC / FEAC

C rack

Front 5

FDI power source

Back 5

MEAC / FEAC

Front 6

when is backup power provided to FDIs

Back 6

when ESS IND AND LTG CONT CB on MEAC is deenergized (bus loss or CB pulled)

Front 7

power for ___ is swapped from ___ to ___ when the ESS IND & LTG CB on ___ stops receiving power

Back 7

- both FDIs
- standby gyro
- red instrument lights

MEAC to FEAC
ESS IND & LTG on MEAC

Front 8

explain all the FDI and standby gyro CBs

Back 8

Primary:
P FDI - ATT IND PILOT (D1) on MEAC
CP FDI / standby gyro (shared) - ATT IND COPLT / V GYRO (D2) on MEAC

Backup: activated by lack of power to ESS IND & LTG CONT (C5) on MEAC
all three - ATT IND / V GYRO on FEAC

Both FDIs and the standby gyro then have a final CB on the no-name bus that secures all power to that component:
- PILOT ATTITUDE IND
- COPILOT ATTITUDE IND
- VERT GYRO

Front 9

peanut gyro power source

Back 9

non-EFDS:
FEAC

EFDS (same as non-EFDS pilot turn needle)
Pri: MEDC
Alt: FEDC with ESS BUS MON switch OFF

Front 10

where do the attitutde indicators get their signals from (FDIs, peanut gyro)

Back 10

FDI - INS 1, INS 2, or standby gyro
peanut gyro - its own internal gyro

Front 11

HSI power source

Back 11

MEAC

Front 12

HSI mode lights power source

Back 12

MEAC

Front 13

altimeter power source

Back 13

mode C - MEAC (pilot side only)
vibrator - MEDC

Front 14

which altimeter provides mode C

Back 14

pilot

Front 15

turn needed power source and location

Back 15

PILOT - non-EFDS
Pri: MEDC
Alt: FEDC with ESS BUS MON switch OFF

COPILOT - non-EFDS
MEDC

EFDS
part of the EFDI (MEAC / FEAC)

Location (turn rate gyro):
under the CP seat

Front 16

turn needles get their inputs from

Back 16

turn rate gyros under the copilot seat

Front 17

radar altimeter power source and location

Back 17

FEAC

doppler well

Front 18

autopilot power source and location

Back 18

Bus A / MDC

C rack

Front 19

OAT indicator power source

Back 19

EMDC

Front 20

AOA power source and location

Back 20

MEDC

transmitter at NAV/COMM station

Front 21

trim indicator power source

Back 21

autopilot trim servo-motor

Front 22

RAWS power source and location

Back 22

MEAC / MEDC

B rack

Front 23

landing gear handle lights power source

Back 23

EMDC

Front 24

VOR-1 power source and location (and name the two types)

Back 24

MEAC / MEDC

VOR nav converter in B rack
Receiver in J rack

ARN-87 old ones
MLR-2020A-1 new ones with protected ILS

Front 25

VOR-2 power source and location (and name the two types)

Back 25

MEAC / MEDC (same as VOR-1)

VOR nav converter in B rack
Receiver in J rack

Front 26

TACAN power source and location

Back 26

MEAC / MEDC

C rack

Front 27

UHF-1 power source and location

Back 27

MEAC / MEDC

F rack

Front 28

UHF-2 power source and location

Back 28

Bus A / MDC

F rack

Front 29

VHF radio power source (and describe the three different kinds)

Back 29

Old non-digital - ARC-197 (VHF only)
Red digital radio - ARC-182 (UHF/VHF)
Back digital radio - ARC-210 (UHF/VHF)

All MEDC

Front 30

HF-1 power source and location

Back 30

MEAC / MEDC

B rack (HF-2 in F rack)

Front 31

HF-2 power source and location

Back 31

Bus A / MDC

F rack (HF-1 in B rack)

Front 32

ADF power source and location

Back 32

MDC

ADF filter - B rack
ADF receiver - F rack

Front 33

INS-1 power source and location

Back 33

MEAC / MEDC
Synchro-excitation voltage - MEAC
Battery backup - FEAC

H rack

Front 34

INS-2 power source and location

Back 34

Bus A / MDC
Synchro-excitation voltage - MEAC
Battery backup - FEAC

H rack

Front 35

marker beacon power source and location

Back 35

MDC

F rack

Front 36

CDNU power source

Back 36

MEDC

Front 37

glideslope receiver power source and location

Back 37

MEDC

B rack

Front 38

GPS receiver power source and location

Back 38

MEAC

C rack

Front 39

ICS power source; how to secure power

Back 39

MEDC
MEAC needed to select radios

COMMUNICATION INTERPHONE DC CB on the FECB panel

Front 40

ICS interconnect box power source and location

Back 40

MEDC

B rack

Front 41

Nav J box power source and location

Back 41

MEAC / MEDC

B rack

Front 42

purpose of Nav J box

Back 42

signals routed to flight instruments through this box

Front 43

TAS computer power source and location

Back 43

MEAC / MEDC

C rack

Front 44

electronic control amplifier purpose, power source, and location

Back 44

boosts navaid output to a usable level for display on instruments

MEAC / MEDC

B rack

Front 45

RAWS power source and location

Back 45

MEAC / MEDC (both RAWS 1 and RAWS 2)

B rack

Front 46

strobe light power source and location

Back 46

Bus B / EMDC

flasher relay: main load center
upper strobe power supply: overhead near main cabin door
lower strobe power supply: HSC

Front 47

SDRS power source and location

Back 47

MDC

MLC

Front 48

what do the left and right pitot tubes connect to

Back 48

left
- pilot airspeed

right
- copilot airspeed
- autopilot air data sensor
- true airspeed transducer
- landing gear warning system

Front 49

RAWS warnings come on when ___ and are inhibited when ___

Back 49

- high: 3 seconds at 380 +/- 20 ft
- low: continuous at 170 +/- 10 ft
- RADALT is unreliable
- loss of power to the RADALT

Inhibited when:
- nose gear is down
- aircraft is on the ground
- flaps below maneuver
- aircraft is 500-1000 ft above reference altitude

Front 50

what items are in the B rack

Back 50

- RAWS 1 & 2
- VOR 1 & 2 nav converters
- glideslope receiver
- ADF filter
- Nav J box
- ECA 1 & 2
- flight director

Front 51

what items are in the C rack

Back 51

C1/C2:
- autopilot
- TACAN
- GPS
- TAS computer
- standby gyro
- rate of turn control

C3:
- sync box
- side windshield heat

Front 52

what items are in the F rack

Back 52

- marker beacon receiver
- ADF receiver
- UHF 1 & 2
- HF-2

Front 53

what items are in the H rack

Back 53

- INS 1 & 2
- MHRS compass couplers 1 & 2
- APX-72 IFF transponder
- ladder power

Front 54

what items are in the J rack

Back 54

- VOR 1 & 2 receivers
- VHF radio

Front 55

what items are in the main load center

Back 55

- runaround relays 1 & 2
- transformer rectifiers 1 & 2
- transfer relays
- sup panels for gens 2, 3, 4, and APU
- fuel flow power supply
- strobe light flasher relay
- prop deice timer
- external power monitor
- SDRS

Front 56

explain TR load meters on MLC CB panel

Back 56

- shows the percentage of load on the TR
- scale of 0.0 to 1.0
- TRs 1 & 2 should be approx equal

Front 57

list items in the HSC

Back 57

- 4 hydraulic pumps
- 2 hydraulic reservoirs
- air brake bottle
- brake accumulator
- aileron boost package
- flap motor
- landing gear control valve
- bottom strobe light power supply

Front 58

list items in the doppler well

Back 58

- cabin exhaust fan
- outflow valve
- radar altimeter

Front 59

which aircraft has single vs. dual RAWS

Back 59

PB-20N autopilots have only one RAWS

Front 60

explain the selection of top vs. bottom antennas with the ___ radio

Back 60

ARC-182 (red digital U/VHF)

- top is VHF only, bottom is U/VHF
- Caution: selection of the top antenna while using a UHF freq could cause radio damage
- if only the top antenna works, CASS is selected on the bottom antenna at the acoustic operator station

Front 61

quickest way to tell if you have a CIP aircraft

Back 61

U/VHF POWER button above copilot CDNU

Front 62

if the UHF 1 & 2 lights aren't working on the ICS panel, but radios actually work

Back 62

communication selector panel power at the NAV/COMM station needs to be turned on

Front 63

how do you know if anyone has ICS DISC selected

Back 63

your ICS OVERRIDE button illuminates green

Front 64

what does ICS DISC do

Back 64

incoming ICS is disconnected from your headset and goes to the other pilot, who cannot select ICS DISC at the same time

Front 65

can you take the aircraft if the INS won't align

Back 65

- don't have to align to get into ATT REF mode
- only time you need them in NAV mode is outside NAVAID coverage

Front 66

max altimeter split

Back 66

+/-75 ft from field elevation
at 10,000 ft: 200 ft
at 20,000 ft: 300 ft

Front 67

max airspeed split

Back 67

5 kts at 140 kts

Front 68

RAWS can be tested by

Back 68

pressing the TEST buttons on MEDC

Front 69

use of TAS heater

Back 69

- should be off except in icing
- Warning: use only during flight

Front 70

weather radar operation with people or when flying

Back 70

not on within
- 15 ft of people
- 75 ft of fueling

Front 71

major effects of MEDC loss

Back 71

- Ess Bus Mon switch needs to be turned off for P turn needle or peanut gyro
- wedge
- no fire protection (tell observers)
- ground air sensing (flight idle stops, REFR OVHT on landing)
- probably fails to feather on #1 or #4
- no bus priorities / transfer relays

Front 72

major effects of MEAC loss

Back 72

- red instrument lights, FDIs, and standby gyro auto swap to FEAC via Ess Int and Ltg CB
- lost INS 1
- lost sychro-excitation voltage to display INS 2 (CP select stby gyro)