MISC
On the CH47 what sheet no. covers Tacan?
SHEET NO. 198
Pressing this line select key on the pilot's CDU will reset the fails counter to zero on the TACAN STATUS page.
What is RS1?
The Chinook's TACAN system receives its tuning commands and sends back navigation data over this specific data bus.
What is MIL-STD-1553B Data Bus 1?
Bearing outputs and other TACAN data are sent to be displayed on these screens via the MIL-STD-1553B data bus.
What are the MFDs (Multifunction Displays)?
This built-in test occurs automatically without operator action to ensure operation is not interrupted.
What is CBIT (Continuous Built-In Test)?
198P3
To prevent damaging the equipment, the TACAN ramp test set must be placed at least this many feet away from the antenna.
What is 10 feet?
When testing the TACAN, if local channels interfere, you must select two alternate frequencies that are this many channels apart.
What is 63 channels?
The TACAN ground station transmits its station identification tone at this specific time interval.
What is 37.5 seconds?
If the FMS displays "XMIT POWER" or "RCVR SENSITIVITY" during an IBIT, the repair action requires replacing this specific component.
What is the TACAN R/T (Receiver/Transmitter)?
On the UH60 what schematic sheet has the tacan antenna?
Sheet 3
This is the specific location under the floorboards where the Chinook's TACAN R/T is mounted and secured with two thumbscrews.
What is the companionway floor?
When you initiate the TACAN self-test mode via the CDU, this symbol replaces the inward-pointing arrow next to LS2.
What is an asterisk (*)?
This mode provides both bearing and distance information to the TACAN ground station, as well as receiving the station ID tone.
What is Air-To-Ground Transmit/Receive (AG TR)?
During the TACAN audio test, you must place the controls on the Test Set to channel 29 and this band type.
What is the Y band?
What is the NSN to the RT mount hardware on the UH60?
5305-00-959-6640
Power for the Chinook's TACAN is fed through a circuit breaker of this amperage rating (C15) in the No. 2 PDP.
What is 5 amperes?
A series of tones will be heard in the crew headsets after approximately this many seconds during a TACAN self-test.
What is 30 seconds?
In AG TR mode, the TACAN ground station inserts a distance reply into the transmitted bearing signal after a delay of this many microseconds.
What is 50 microseconds?
To prevent false station bearing signals during troubleshooting, the helicopter must be moved outside at least this many feet away from large metallic objects.
What is 50 feet?
Located at STA 103.00, RBL 31 on the bottom of the Chinook, this is the model number of the blade-type TACAN antenna.
What is AT-741A?
If the TACAN STATUS page displays "DEG" instead of "GO," the technician must refer to this specific Work Package.
What is WP 1449?
The pilot and copilot can monitor the TACAN station ID tone by pulling this specific push-pull switch on the ICS control panel.
What is the number 2 NAV switch?
Electrical power of 28 VDC is supplied to the TACAN set by this specific primary bus.
What is the NO. 2 DC PRI bus?