_____________________
A. Speed Sensor
The speed sensor has:
-
a permanent magnet,
-
a pole piece,
-
a coil,
-
a housing.
At 7% APU speed the speed sensors give a frequency of approximately 550
Hz and a voltage of approximately 0.5 VAC from peak current to peak
current.
Power Indicating - Component Location
Figure 001
CES
Speed Indication System - Block Diagram
Figure 002
CES
At 100% APU speed the speed sensors give a frequence of approximately
19720 Hz.
The speed sensors give the frequency in proportion to the APU speed.
6. Operation/Control and Indication
________________________________
(Ref. Fig. 002, 003)
A. Operation The speed sensors measure the APU speed and transmit a frequency to the ECB. The ECB monitors the power indication during all APU operating conditions (Ref. 49-61-00). The ECB starts the automatic shutdown sequence if both speed sensors are defective. The PMG transmits a speed signal to the ECB. This speed signal is used by the back-up overspeed protection.
B. Control and Indication The lower ECAM display unit shows the APU speed in percent on the APU page (Ref. 49-00-00).
PMG Speed Signals Figure 003
R EFF : 106-106, 108-149, 211-299, 301-399, Page 549-71-00 Config-3 Aug 01/05
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SENSOR - SPEED - REMOVAL/INSTALLATION
_____________________________________
R **ON A/C 001-003, 051-099, 401-499,
TASK 49-71-13-000-001
Removal of the Speed Sensors (8060KM1) and (8060KM2) (GTCP 36-300)
WARNING : DO NOT TOUCH THE APU UNTIL IT IS SUFFICIENTLY COOL TO PREVENT BURNS
_______
WHEN YOU DO THE MAINTENANCE TASK(S).
1. Reason for the Job
__________________
Self Explanatory
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------
REFERENCE QTY DESIGNATION
-------------------------------------------------------------------------------
No specific blanking caps
No specific blanking plugs
No specific circuit breaker(s) safety clip(s)
No specific access platform 3.5 m (11 ft. 6 in.)
B. Referenced Information
-------------------------------------------------------------------------------
REFERENCE DESIGNATION
-------------------------------------------------------------------------------
24-41-00-861-002 Energize the Aircraft Electrical Circuits from the External Power 29-00-00-864-001 Put the Related Hydraulic System in the Depressurized
Configuration before Maintenance Action
52-41-00-010-001 Open the APU Doors for Access
49-71-13-991-001 Fig. 401
3. Job Set-up
__________ Subtask 49-71-13-860-053
A. Aircraft Maintenance Configuration
(1)
Energize the aircraft electrical circuits
(Ref. TASK 24-41-00-861-002).
(2)
On the panel 25VU, make sure that the APU MASTER SW pushbutton switch is off.
(3)
Put a warning notice in the cockpit to tell persons not to start the APU.
(4)
Make sure that hydraulic systems are depressurized
(Ref. TASK 29-00-00-864-001).
Subtask 49-71-13-865-050
B. Open, safety and tag this(these) circuit breaker(s):
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------121VU APU/APU/CTL 2KD L42 121VU APU/ECB/SPLY 1KD L41
Subtask 49-71-13-010-050
C. Get Access
(1)
Put the access platform in position below the APU access doors 315AL and 316AR.
(2)
Open the APU access doors 315AL, 316AR (Ref. TASK 52-41-00-010-001).
(3)
Set the LIGHT control switch to the ON position.
4. Procedure
_________
(Ref. Fig. 401/TASK 49-71-13-991-001) Subtask 49-71-13-020-050
A. Removal of the Speed Sensor (8060KM1) or (80160KM2)
(1)
Remove and discard the lockwire and disconnect the electrical connector (1) from the speed sensor (8060KM1) and (80160KM2) (2).
(2)
Put blanking caps on the disconnected electrical connectors.
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