2. FLIGHT DECK AUDIO
SYSTEM
- a means of alerting appropriate
members of the crew and other
personnel of the aircraft.
• Flight Interphone System
• Service Interphone System
• Cabin Interphone System
• Ground Crew Call System
• Passenger Address(PA) System
3.
4. Interphone Systems
- Permits the conversation between the cockpit
and someone outside the aircraft, usually
maintenance or service personnel.
Operation of Interphone Systems:
Phone jacks are available at different
locations which are handset or headset can be
connected.
Handset or headset contains microphone, a
small speaker and a push-to-talk
switch(PTT).
7. Flight Interphone System
- allows communication between the flight crew
members, and between the flight crew and the
ground mechanic at the external power receptacle or
in the avionics bay.
- The primary purpose is to provide private
communication between cockpit crewmembers
without intrusion from the service interphone.
- It also extends communication to ground personnel
at the nose gear interphone station.
8. - The ground crew may also use flight
interphone through a jack at the external
power receptacle.
9. NOSE LANDING GEAR
On the external power control panel, some features are dedicated to ground mechanic
to-flight crew or flight crew-to-ground mechanic calls.
10. External Interphone Jacks
Located in:
The nose-wheel area.
The avionics equipment bay area
The aft fuselage near the Auxiliary Power
Unit(APU)
13. Service Interphone System
• Provides intercommunication
between the flight crew, cabin
attendants, ground crew or
maintenance personnel.
• Jacks for plug-in microphone and
headsets are installed at various
locations in the aircraft.
18. Attendants Interphone Handset
• Handheld pushbutton switch is located on
the grip to activate the mic.
• The flight attendants communicate between
flight attendant stations or the cockpit using
any of the attendant handsets.
• Handsets are permanently installed at each
attendant’s station
21. Ground Crew Call System
- The crew call system is a three-way alerting
system that signals crew members to use the
interphone system.
The three types of crew call are:
Captain’s Call – A “Hi tone” chime sounds
once and the Captain’s CALL light illuminates.
This advises the flight crew that a call has been
initiated from the attendant’s panel or ground crew
panel.
22. Attendant Call – A “Two-tone” chime
sounds and the “Pink Master Call” lights
illuminates when an attendant’s call is initiated
from the flight compartment or either
attendant’s panels. The lights reset at the
attendant’s panels.
Ground Crew Call – When the ground crew
call is initiated in the flight compartment, a call
horn sounds in the nose wheel well.
23.
24. Passenger Address System
• The system provides a means of transmitting
flight crew announcements, boarding music and
chime signals to the passenger cabin.
Attention is gained through the use of lights and
aural signals (chimes or horn).
The system can be activated from the cockpit, either
flight attendant station, or from external power.
• Passengers may also use the system to summon
an attendant, through the use of individual call
switches at each seat.
25. • The cockpit may be called by either flight
attendant station, or by the ground crew.
The ground crew may only be called by the cockpit.
Flight Attendants may be called by the cockpit, the
other attendant station, or by any passenger seat or
lavatory.
Master call lights in the passenger cabin identify the
source of incoming calls to the attendants.
28. There are four levels of priority assigned to the
Passenger Address System
Announcement by the pilot have first priority.
Announcement by the flight attendants.
Pre-recorded announcements follow as third level.
Boarding music.
• A chime is produced when the pilot turns on the
“fasten seat belt” or “no smoking” signs.
• Pre-recorded announcements initiated by the pilot
or by the flight attendant, and these messages are
initiated automatically in the event of a cabin
depressurization.
32. Emergency Locator Transmitter(ELT)
• The Emergency Locator Transmitter (ELT) is a self-
contained battery operated transmitter that is designed to
help locate an airplane after a crash.
• In the event of crash the transmitter emits the two
emergency Frequencies:
- VHF band- 121.5 MHz and
- UHF band- 243.0 MHz
- For modern ELT operate under UHF band 460.025 MHz
• The battery in an ELT has a design life long enough to
operate the transmitter continuously for 48 hours.
33. • The ELT System emits an omnidirectional signal on
the international distress signals at:
121.5MHz- is monitored by General- aviation aircraft,
commercial aircraft, the FAA, and the CAP (Civil Air
Patrol).
243.0 MHz- is monitored by the military services.
• An Emergency Locator Transmitter is also referred
as locator beacon is required on aircraft:
To provide a signal or signals that will enable search
aircraft or ground stations.
To find aircraft that have made crash landings in remote or
mountainous areas.
34. • ELT’s are installed as far aft in the fuselage as it
is practical to place them, and they are connected
to a flexible whip antenna.
Flexible whip Antenna
36. TYPE CLASS DESCRIPTION
A or AD Automatic Deployable or
Automatic ejectable
• This type is expensive and
is seldom used in GENAV.
• This type of ELT which is
rigidly attached to an
aircraft and which is
automatically deployed and
activated by impact, and, in
some cases, also by
hydrostatic sensors.
F or AF Automatic Fixed or Fixed(non-
ejectable)
• This type is the most
general aviation aircraft use
in GENAV.
• An automatically activated
ELT which is permanently
attached to an aircraft.
• This transmitter can be
manually activated or
deactivated and can be
remotely controlled from
the cockpit.
• Provision also be made for
recharging the ELT’s
batteries from the aircraft’s
37. Types of ELT
Automatic Deployable or
Automatic ejectable
Automatic Fixed or
Fixed(non-ejectable)
38. TYPE CLASS DESCRIPTION
AP Automatic Portable • This type of ELT is similar
to Type-F or AF except that
the antenna is integral to
that unit for portable
operations.
• An automatically activated
ELT which is rigidly
attached to an aircraft but
readily removable from the
aircraft.
P Personal Activated • This type of ELT has no
fixed mounting and does
not transmit automatically.
• Instead a switch must be
manually operated order to
activate or deactivate the
ELT’s transmitter.
40. TYPE CLASS DESCRIPTION
W or S Water Activated or Survival • This type of ELT transmits
automatically when
immersed in water.
• It is water proof, floats and
operates on the surface
water.
• It has no fixed mounting
and should be tethered to
survivors or life rafts by
means of the supplied cord.
41.
42. Maintenance and testing of ELT
ELT should be regularly inspected in accordance with the
manufacturer’s recommendation.
ELT should be checked to ensure that it is secure, free of
external corrosion, and that the antenna connections are
secure.
Ensure that the ELT batteries have not reached their
expiry date and that the only approved battery types are
fitted.
• ELT is powered by the alkaline battery pack.
43. Non- rechargeable batteries must be replaced or
chargeable batteries recharged.
Simple air tests between an aircraft and ground station
can be sufficient to ensure that an ELT is functional; it is
also important to follow manufacturers instructions.
To avoid unnecessary SAR(Search and Rescue) missions,
all accidental ELT activations should be reported to the
authorities giving the:
• Location of the transmitter
• The time and
• Duration of the accidental transmission
44. Testing of an ELT must be conducted only during
the first five minutes of any UTC hour and
restricted duration to not more than five seconds.
The ELT is battery powered and is automatically
turned on by crash forces. It will transmit signal
for 48 hours on the different frequencies for ELT.
46. 1. When installed in a fixed wing aircraft, ELT should be
mounted with its sensitive axis pointing in the direction
flight.
2. When installed in a rotorcraft ELT should be mounted
with its sensitive axis pointing approximately 45°
downward from the normal forward direction of flight.
3. The location chosen for the ELT should be sufficiently
free from vibration to prevent involuntary activation of
the transmitter.
4. ELT should be located and mounted so as to minimize the
probability of damage to the transmitter and antenna by
fire or crushing as a result of a crash impact.
5. ELT should be accessible for manual activation and
deactivation.
47. 6. The external surface of the aircraft should be marked to
indicate the location of ELT.
7. Ensuring that the appropriate notices are displayed.
