AF 101-120, 123-154, CONFIG 1 172-173, 191-194; GN ALL; 08 Page 6 LH ALL AND MD ALL Sep 25/94
34-31-00
(2)
Magnetic heading from the magnetic heading reference system is used to position the compass card through a servo drive system. On LH 001-010 and AF 101-120, 123-151, a repeater synchro in the VOR/DME RMI furnishes the magnetic heading signal to the selected VOR/ILS receiver for generation of the VOR bearing signal. On LH 011-099; AF 152-154, 172-173, 191-194; GN ALL and MD ALL, a repeater synchro in the ADF RMI furnishes the magnetic heading signal to the VOR/ILS receiver for generation of the VOR bearing signal.
(3)
The radio bearing display on the RMI consists of two concentrically-mounted pointers: one wide and one narrow. The two pointers display radio bearing information for two VOR or ADF stations with the compass card taken as reference. On each VOR/DME RMI, VOR 1 or VOR 3 bearing is displayed by the narrow pointer while the wide pointer displays VOR 2 or VOR 3 bearing. VOR warning flags appear when the VOR data is unreliable or absent.
(4)
For additional description, operation, service and maintenance instructions applicable to the RMI, refer to 34-21-00, Magnetic Heading Reference System; 34-55-00, DME System; and 34-57-00, Automatic Direction Finder System.
B. Horizontal Situation Indicator
(1)
Each of the captain's and first officer's instrument panels has a horizontal situation indicator (HSI). The HSI is a multifunction display instrument receiving inputs from and providing displays for several electronic systems installed on the airplane. Additional description, operation, service, and maintenance instructions for the HSI are provided in 34-41-00, Inertial Navigation System.
(2)
A radio or INS annunciator indicates the navigation system to which the HSI is connected. The annunciator display indicates VOR/ILS when the VOR/ILS-INS switch is in the VOR/ILS position.
(3)
The glide slope deviation pointer on the HSI display indicates the vertical deviations of the airplane from the glide path when approaches are being made. The GS flag comes into view when glide slope data is missing or unreliable. The glide slope pointer and flag are biased out of view when the VOR/ILS-INS switch is in the INS position or when the VOR/ILS navigation system is tuned to a VOR frequency.
(4)
The navigation warning flag comes into view on the HSI when missing or invalid data is furnished from the VOR/LOC or from the INS, depending on the position of the VOR/ILS-INS switch.
(5)
The to-from pointer indicates the direction of the tuned VOR station If a valid VOR signal is lost or if the airplane is directly over the VOR station, the to-from pointer is masked from view.
(6)
The course deviation bar indicates the deviation from the selected course. With the airplane on course, the course deviation bar lines up with the course arrow and tail. Either the VOR/ILS receiver or the inertial navigation system controls the course deviation bar depending upon whether the VOR/ILS-INS switch is positioned to VOR/ILS or INS.
C. Attitude Director Indicator
EFFECTIVITY
AF 101-120, 123-154, CONFIG 1 172-173, 191-194; GN ALL; 04 Page 7 LH ALL AND MD ALL Sep 25/94
34-31-00
(1)
Each of the captain's and first officer's instrument panels has an attitude director indicator (ADI). The ADI is a multifunction display instrument receiving inputs from and providing displays for several electronic systems. Additional description, operation, service, and maintenance instructions for the ADI are provided in 34-41-00, Inertial Navigation System.
(2)
Glide slope deviation is presented by the glide slope deviation pointer which moves above and below center. Similarly, a pointer at the bottom of the ADI moves left and right of center to indicate localizer deviation signals. The glide slope pointer and flag are biased out of view when the VOR/ILS-INS switch is in the INS position or when the VOR/ILS navigation system is tuned to a VOR frequency.
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