A. The air traffic control (ATC) system, when interrogated by a ground station, automatically transmits a pulse coded signal to the ground station containing airplane altitude and identity information. This signal is displayed on a PPI used by ground personnel to monitor airplane traffic.
19. DME System (34-55-00) Collins 860E-2 (AF 101-151)
__________ King KDM-7000 (AF 152-199; AT ALL; GN ALL; MD ALL)
A. The DME (distance measuring equipment) system is used to determine airplane distance from a VOR/DME ground station. An interrogator unit in the airplane transmits a pulse coded signal to the ground station which triggers a time delayed reply. The time interval between the interrogating signal and ground station reply is measured and displayed as distance on a digital or analog indicator.
20. ADF System (34-57-00) Collins 51Y-7 (AF 152-154, 191-199; LH 051-070,
__________
081-099; AT ALL; GN ALL; MD ALL; VM ALL)
EFFECTIVITY
AF ALL
AT ALL
GN ALL CONFIG 2 MD ALL 01 Page 4 VM ALL Apr 25/91
34-00-00
LOCALIZER NO. 3
GLIDE SLOPE CAPTURE
ANTENNA LOCATED IN
NOSE RADOME (AT ALL;
GN ALL; MD ALL;
AF 152-199)
747 Navigation Antenna Location Figure 1
EFFECTIVITY
CONFIG 2
AF ALL; AT ALL;
704 Page 5
GN ALL; MD ALL
34-00-00
Apr 25/91
747 Navigation Systems Block Diagram Figure 2
EFFECTIVITY
CONFIG 2 AF ALL; AT ALL; GN ALL;
704 Page 6 MD ALL; VM ALL
34-00-00
Dec 25/83
A. The automatic direction finder (ADF) system is used to determine airplane bearing from a conventional broadcast or low range radio station. The radio signal is simultaneously received by an omnidirectional sense antenna and a bidirectional loop antenna and resolved into a single component representing the angular position of the radio station. This station bearing is displayed relative to airplane magnetic heading on the airplane radio magnetic indicator (RMI).
21. Performance Management System (34-62-00) (When Installed)
_____________________________
A. The performance management system (PMS) provides both throttle and pitch control to attain and maintain required altitudes and speeds with the most efficient use of fuel for the selected climb, cruise or descent mode of operation. For example, during cruise the pitch control maintains the airplane altitude at the selected altitude, smooths out temporary speed changes and reduces throttle activity. The throttles are controlled during cruise to compensate for longer term effects on speed.
B. The performance management system (PMS) also provides waypoint control over the inertial navigation system (INS) so that all waypoint data may be entered into the PMS rather than into the INS. The PMS stores distance measuring equipment (DME) station data in the PMS computer unit memory. This data is selected for a desired flight plan and is also used by the PMS to provide DME updated present position to the INS.
EFFECTIVITY
AF ALL
AT ALL
GN ALL CONFIG 2 MD ALL 01 Page 7 VM ALL Dec 25/83
34-00-00
NAVIGATION - DESCRIPTION AND OPERATION
______________________________________
1. General
_______
A. The navigation systems are those systems used to determine and display the attitude, altitude, and position of the airplane with respect to the earth's surface. The navigation systems fall in the following general catagories:
(1)
Those systems which sense and display flight environmental data.
(2)
Those systems which determine airplane attitude and direction.
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本文链接地址：747飞机维护手册AMM CHAPTER 34 - NAVIGATION 第34章导航1(14)
