747飞机维护手册AMM CHAPTER 34 - NAVIGATION 第34章导航1(81)

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Metric Altitude Indicator (ON LH ALL) (Fig. 1, Sheet 2) XA A. The metric altitude indicator, located on the captain's main instrument XA panel P1, displays uncorrected metric altitude from - 300 to 15,000 XA meters and barometric correction from 950 to 1,050 millibars. XA (1) The metric altimeter is independent of the central air data XA computers and primary altimeter indicators. The instrument is XA pressurized through the captain's static system manifold. XA (2) Altitude is indicated on the front dial of the altimeter by one XA pointer and a three digit mechanical counter drum. The pointer XA reads altitude to nearest 10 meters. The digits on the drums XA indicate 100, 1,000 and 10,000 meters. XA (3) The altimeter contains a barometric correction mechanism. Manual XA operation of a BARO set knob at the lower left corner of the XA instrument adjusts the altitude indicating devices and the XA barometric counter simultaneously to correct for changes in ground XA level pressure. XA B. The metric altitude indicator is connected to the captain's instrument XA light 5 VDC power source. No other electrical connections are required.
 EFFECTIVITY

 
 ALL  ATG Page 18  Aug 25/8734-13-00
 AIR DATA PRESSURE INSTRUMENTS - TROUBLE SHOOTING
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 1.  General
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 A.  Malfunctions in air data pressure instruments are checked by operating the central air data computer system (34-12-00) and pitot-static system (34-11-00) in conjunction with indicators. Therefore, all air data instruments other than the two vertical velocity indicators are checked in 34-12-00, Central Air Data Computer System - Trouble Shooting.
 B.  While performing any trouble shooting procedures on air data instruments, heaters in pitot-static probes and total air temperature probes must remain off. Do-not-operate identifiers must be placed on all probe heater switches. (Refer to 30-31-00, Pitot-Static and Temperature Probe Anti-Icing.)
 NOTE: With total air temperature probe heat on, on the ground, TAT and
____ SAT (if installed) indications will not be accurate and flags may appear. This is a normal condition.
 C.  To troubleshoot a suspected malfunction in a vertical velocity indicator, perform vertical velocity indicator portions of 34-12-00, Central Air Data Computer System - Adjustment/Test (System Test).
 (1)  
If test results are out of tolerance, replace indicator and repeat test.

 (2)  
If test results are not corrected, troubleshoot applicable static pressure system per 34-11-00, Pitot-Static System - Trouble Shooting

 EFFECTIVITY

 
 ALL  01 Page 101  Oct 10/7334-13-00
 AIR DATA PRESSURE INSTRUMENTS - ADJUSTMENT/TEST
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 1.  General
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 A.  The operational and system tests for the air data pressure instruments are performed in conjunction with the central air data computer system adjustment/test (34-12-00). The computer serves as an installed input device during test. When treated as an integral system, the overall function and accuracy from input to readout is checked at one reading, and thus, interface integrity is assured. Air data instrument tests that do not require central air data computer inputs are included, since they can also be performed with the pitot-static system (34-11-00) connected to pneumatic test equipment. The operational test is self-contained and gives a confidence test of the basic air data system using on-board equipment only. The system test is predicated on a successful completion of the operational test and cannot be performed alone.
 EFFECTIVITY

 
 ALL  01 Page 501  Oct 10/7334-13-00
 INSTANTANEOUS VERTICAL VELOCITY INDICATOR - REMOVAL/INSTALLATION
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 1.  Referenced Procedures
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 A.  34-13-01, Adjustment/Test
 2.  Remove Instantaneous Vertical Velocity Indicator
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 A.  Loosen instrument mounting clamp and slide indicator out of instrument panel.
 CAUTION: DRAW INDICATOR OUT OF INSTRUMENT PANEL WITH CARE TO AVOID
_______ STRESS AND/OR DAMAGE TO CABLE AND PNEUMATIC HOSES AT BACK OF CASE. PITOT AND STATIC SYSTEM PRESSURES MUST BE AT AMBIENT BEFORE PROCEEDING TO AVOID INSTRUMENT DAMAGE.
 B.  Disconnect electrical connector on rear of indicator case.
 C.  Disconnect static pressure hose from rear of indicator case by operating quick-disconnect fitting.
 3.  Install Instantaneous Vertical Velocity Indicator
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