Controls and Indications Overhead Panel Flashcards
Cabin Altitude Selector
NORM - cabin altitude controller A or B selected automatically on alternated flights.
A - a is the primary selected but will still switch to B if failure occurs
B - primary selected but will still switch to A if failure occurs
Pack RST
Push - resets pack fault protection system if fault no longer exists
SYS Fault - pack overheat or any fault in system
NAI modes
OFF - NAI valve is commanded closed
AUTO - in flight, NAI operates when icing conditions exist
ON - NAI valve opens when engine bleed air is available.
Engine igniters are operating continuously
Bleed PRV opens
Drive DISC switch modes
Push -
1 disconnects IDG from engine
2 Opens GCB
Engine Bleed Air
ON - engine bleed, HP, PRV air valve open, for start
Off - Bleed, HP, PRV valves closed
EXT 1, 2 Switch modes
EXT. 1 - Avail -pwr quality is acceptable
ON - Pwr connected to AC elec Sys
EXT. 2 - Avail - pwr quality is acceptable
On - pwrs main deck Cargo handling bus
HYD DEM pump selector
OFF - pumps off
Auto - high demand pump operates when required – 1 & 4 operate when TE flaps in transit or flaps past 1
(AUX) - on system 4 operates on the GND until engine started
APU Selector modes
OFF - closes bleed air isolation valve ON - 1 opens fuel valve 2 opens inlet dr 3 arms bleed isol valve 4 activates 1 DC and 2 AC fuel pumps
Auto IGN Selector
Single - EEC alternates igniter 1 and 2 for ground start
Both - selects all igniters
Demand Pump Press light
Illuminated = dem pump selected off, or output press low
CON IGN
On - igniters operate continually and commands approach idle
HYD SYS Fault Light
Iluminated = Low Hyd pressure, res. quantity, high temp.
Auto Start Switch
On - arms the autostart system
off - autostart is disabled, start is manually controlled
Pack Control Selectors
OFF - Pack valve closed
Norm - pack controller A or B selected automatically
L, R, Utility modes
Off - pwr removed from ECLU and resets fault logic
ON - each switch pwr’s 2 ECLU busses
STBY PWR Switch modes
OFF - STBY pwr not available
AUTO - Allows Main and APU STBY buses to be pwred from available sources
Bat - sys enters att mode and pos. and veloc info lost until reset on gnd.
YAW Damper modes
ON -yaw damper is powered
INOP - yaw damp is off or inop
ISLN Light
isol valve position disagrees with switch
on - valve open
off - valve closed
EEC’s 2 Modes
Norm - sets thrust using N1 RPM
ALTN - Alternate Engine Control Mode
BATT switch modes
ON -Connectes MAIN/APU Hot batt to Main/Apu batt
OFF - Disconnects Main/APU Hot batt from Main/Apu Batt
GEN CONT Switch Modes
ON - arms GCB to close when engine GEN comes online
OFF - Opens GEN field GCB, Isolates GEN from AC Buses
How many EIU (Symbol Generators)
3 - L, C, R
Engine Start Switches
Pull(Auto ON) - arms start valve and open bleed air valve
Pull(auto off) - open’s start Valve and blled air valve
Releases at 50% N2 RPM - start and bleed valves close
Light Illuminated start valve is open
HYD Engine Lights
ON- pump press. sys when engine rotates
PRESS - Low engine HYD pressure
