-
a compensation base with these properties: . a horizontal area in which the horizontal component of the earth's magnetic field is ( +/- 1 degree ), .sufficiently large for the aircraft be turn smoothly 360 degrees, .with no metal objects near it ( no vehicles or other aircraft in a radius of 250ft, no buildings with magnetic materials in a radins of 600ft around the ai rcraft ).
(1)
Make sure that there are no ferromagnetic parts installed near the standby compass. Ferromagnetic parts near the standby compass can cause compass heading errors(fasteners, tools, etc...).
(2)
Energize the aircraft electrical circuits from the APU (Ref. TASK 24-41-00-861-002).
(3)
Make sure that the standby compass operates correctly (Ref. TASK 34-22-00-710-001).
(4)
Do the EIS start procedure (NDs only)(Ref. TASK 31-60-00-860-001).
(5)
Do the IR alignment procedure(Ref. TASK 34-10-00-860-004).
(6)
Adjust the position of the aircraft until its lubber line points to the North with a deviation less than 2..
(7)
On the ADIRS CDU set the DISPLAY DATA selector switch to HDG.
1EFF : ALL 1 34-22-00Page 505 1 1 Feb 01/00R 1 1 1CES 1
Subtask 34-22-00-865-050
B. Make sure that these circuit breakers are closed to get the radio/ magnetic environment that usually occurs in flight :
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------
R **ON A/C 001-049, 101-105, 151-199,
49VU COM/HF1 1RE1 HA14
**ON A/C ALL
49VU NAV/VOR/1 49VU COM/VHF/1 49VU NAV/ADF/1 2RS1 2RC1 1RP1 G13G09H14
R **ON A/C 051-099, 106-149, 201-299, 301-399,
49VU COM HF1 1RE1 HA14
R **ON A/C 001-049, 051-099, 101-105, 151-199, 201-210, 301-399,
121VU COM NAV/HF2 1RE2 L13
**ON A/C ALL
121VU COM NAV/VOR/2 121VU COM NAV/ADF/2 121VU COM NAV/VHF/3 121VU COM NAV/VHF/2 2RS2 1RP2 2RC3 2RC2 K08K02L05L04
R **ON A/C 001-049, 051-061, 101-105, 201-203,
Subtask 34-22-00-020-050
C. Below the display window on the front face of the standby compass: - remove and safety the protection cover of the compensator.
1EFF : ALL 1 34-22-00Page 506 1 1 May 01/05 1 1 1CES 1 **ON A/C ALL
4. Procedure
_________
R **ON A/C 001-049, 051-061, 101-105, 201-203,
Subtask 34-22-00-730-050
A. Compensation Adjustment/Test of the Standby Compass
NOTE : The reference magnetic heading referred to in this procedure is
____ the true heading indication read on the ADIRS CDU. Magnetic heading = true heading + magnetic variation (a natural phenomenom which varies continuously).
(1)
On the standby compass:
-put the 2 mm-wide non magnetic screwdriver into the EW hole below the display window
-use the non magnetic screwdriver to set the EW compensation system to zero
-put the non magnetic screwdriver into the NS hole below the display window
-use the non magnetic screwdriver to set the NS compensation system to zero.
(2)
Use the system in operation to set the aircraft to north (MHN) (Magnetic Heading North):
-calculate and write the magnetic deviation DN between the MHN and the CH (Compass Heading Indication of the Standby Compass): DN = MHN - CH
-the Adjustment Value (AV) is equal to DN
-correct the CH with the AV to get the compensated compass heading indication (CCH)
-put the non magnetic screwdriver into the NS hole of the standby compass
-use the non magnetic screwdriver to set the standby compass to CCH. Example: . if MHN = 360. and CH = 356. DN = 360. - 356. = +4. AV (adjustment value) = +4 Correct the Compass Heading indication of the standby compass (CH) with the AV to get the CCH 356. + 4 = 360. . if MHN = 0. and CH = 002. DN = 0. - 2. = -2.
1EFF : ALL 1 34-22-00Page 507 1 1 May 01/05 1 1 1CES 1 AV (Adjustment Value) = -2. Correct the Compass Heading indication of the standby compass (CH) with the AV to get the CCH 2. +(-2.) = 0
(3)
Set the aircraft to East (MHE):
-calculate and write the magnetic deviation DE between the MHE and the CH DE = MHE - CH
-the Adjustment Value (AV) is equal to DE
-correct the CH with the AV to get the CCH
-put the non magnetic screwdriver into the EW hole of the standby compass
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