AS 14 - Transponders Flashcards
Review Questions
What’s the difference between tracking and homing a navaid?
If drift information is available, apply the drift and “track” the navaid.
If no drift is applied, the needle is placed on the nose and the aircraft “homes” the navaid.
What two vital pieces of information do transponders provide?
Identification
Altitude
What are the three military Transponder modes currently used in North America?
Mode 1 - 2 digit ident code selected on control unit
Mode 2 - 4 digit ident code on selected R/T
Mode 4 - Encrypted challenge and reply code
What are the three civilian Transponder modes currently used in North America?
Mode 3/A - 4 digit code (squawk code)
Mode 3/C - 4 digit code and pressure altitude from DADC system (squawk code + altitude)
Mode 3/S - 4 digit code and pressure altitude and other pertinent info (squawk code + altitude + requested info)
There are several predetermined MODE __ codes that apply to all aircraft.
MODE 3
What do the following MODE 3 codes mean?
7500
7600
7700
Hijack
Comm Failure
Emergencies
What is the name of the transponder on the CT 142?
Collins TDR-64/94D
What does the transponder on the CT 142 provide?
ATC ID code, AC altitude and the MODE S aircraft unique aircraft code
Where are the antennas for the Collins TDR-64/94D located on the aircraft?
Beneath forward fuselage and on top of mid fuselage.
The Collins TDR-64/94D control unit provides the means to set:
ATC squawk codes Modes of operation Self test operation Annunciators; and Self test diagnostics
What does the Collins TDR-64/94D provide ATC?
Altitude and AC identification, as well as specific aircraft info if requested
Describe Mode S for the transponder.
Consists of 16 million separate codes giving each AC its own unique identity
Can provide ATC with additional requested data from the FMS (hdg, speed etc)
Can provide data link
Regarding Mode S for the transponder, what does data link provide?
Clearances and routing
Weather and maps
Aircrew can acknowledge by the push of a button
True or false
Mode S is an integral component of the TCAS
True
What is the Bendix AN/APX 100 (V)?
A IFF and a Special Identity Function system and is a combination of civil and military transponders.
In addition to Mode 3/A and C the Bendix AN/APX 100 (V) can also reply to __ , __ and __ interrogations.
1, 2 and 4
What is the Traffic Alert and Collision Avoidance System (TCAS)?
An automatic collision avoidance system.
How does the TCAS function?
It constantly sends out interrogations to any aircraft with at least a Mode A transponder and will automatically respond.
What will the TCAS provide?
Either traffic alerts and/or resolution advisories without input from ATC
The CT 142 TCAS requires other aircraft to have at least Mode __ transponder.
Mode C
If the IFF system is selected, the TCAS will not be operational because?
Mode S is put into standby mode.
The TCAS control panel and the corresponding TCAS display is integrated with what?
The Vertical Speed Indicator
TCAS commanded avoidance maneuvers will most often involve what?
A climb or descent
What are the principles of operation for the Radio Altimeter?
Pulse is transmitted from AC to ground and reflected back
Time taken to complete cycle is measured
Time converted into distance = height
A radio altimeter displays what in feet?
Absolute altitude
What errors does a radio altimeter not contain, unlike a pressure altiemter.
Temperature and density errors
What are the basic components of a radio altimeter?
Receiver / transmitter
Indicator
Antenna system
Where are the basic components of the radio altimeter located?
Receiver / transmitter located in avionics rack
Two antennas on underside of fuselage
Self test and status light indicators
What is the operating range and increments of the CT 142 radio altimeter?
0 - 2500 ft @ 10 foot increments
What uses the radio altimeter?
The GPWS, Flight Guidance Computer, Air Data Computer and Flight Data Recorder
What is the name of the Ground Proximity Warning System aboard the CT 142?
Sunstrand Mark ll
What does the GPWS provide?
A visual and synthesized aural voice annunciation
When is the GPWS active?
Whenever the aircraft is powered (ie. automatic)
What are the components of the GWPS?
Computer unit (in avionics rack) Cockpit speaker and variable annunciator L and R side PULL UP/ GWPS TEST switch lights (glareshield) L and R side BELOW G/S (Glide Slope) cancel switch lights (glareshield) GWPS flap override switch (pilot side console) The GWPS fail light (master caution panel)
The various ground proximity cockpit warnings are activated how?
Upon violation of any of the six different flight profile conditions.
GPWS Warning Modes - Mode 1
Excessive sink rate
GPWS Warning Modes - Mode 2A
Excessive Closure rate
GPWS Warning Modes - Mode 2B
Excessive closure rate on landing approach
GPWS Warning Modes - Mode 3
Altitude loss after take off
GPWS Warning Modes - Mode 4A
Proximity to terrain, gear up
GPWS Warning Modes - Mode 4B
Proximity to terrain, flaps up
GPWS Warning Modes - Mode 5
Descent below glideslope
GPWS Warning Modes - Mode 6
Descent below radio altitude DH
Regarding GWPS, inputs are continually processed to provide airplane flight path surveillance between __ and ____ feet AGL.
50 and 2450 ft AGL
With the exception of “GLIDESLOPE” and “TOO LOW FLAPS” violations, all other aircraft warnings can only be cancelled how?
Taking the corrective action
If the aircraft is near the stall speed, what happens to the GWPS and why?
The GWPS is inhibited from the stall warning computer during the time the shaker is energized.
The GWPS caution light on the caution/ warning lights panel comes on to indicate what?
A GWPS malfunction
Review Questions
On routine 402 Sqn missions, which is the primary transponder?
Collins TDR-94-94A ATC
Review Questions
Which SSR mode does the Collins TDR-94-94A ATC use?
Mode S
Review Questions
Which SSR mode can the Bendix AN/APX 100 use?
Military 1,2,4 and civil 3/A and C
