THS ACTUATOR VALVE BLOCKS - ADJUSMENT/TEST

Transcription

1 1. Reason for the Job WARNING: THS ACTUATOR VALVE BLOCKS - ADJUSMENT/TEST CHECK THAT LANDING GEAR GROUND SAFETIES, INCLUDING WHEEL CHOCKS ARE IN POSITION. BEFORE APPLYING OR RELIEVING HYDRAULIC SYSTEM PRESSURE, MAKE CERTAIN THAT THE TRAVEL RANGES OF THE CONTROL SURFACES ARE CLEAR. BEFORE PRESSURIZING HYDRAULIC SYSTEMS, CHECK THAT ALL CONTROLS ARE SET TO CORRESPOND WITH THE ACTUAL POSITION OF THE SERVICES THEY OPERATE. BEFORE PROCEEDING WITH MAINTENANCE WORK ON OR NEAR MECHANICAL FLIGHT CONTROLS OR PRIMARY FLIGHT CONTROL SURFACES, LANDING GEARS, ASSOCIATED DOORS OR ANY MOVING COMPONENT, MAKE CERTAIN THAT GROUND SAFETIES AND/ OR WARNING NOTICES ARE IN CORRECT POSITION TO PREVENT INADVERTENT OPERATION OF CONTROLS. A. Verification of synchronization of the actuator valve blocks. B. Adjustment of actuator valve blocks after slight desynchronization. C. Adjustment of actuator valve blocks after significant desynchronization. 2. Equipment and Materials WARNING: CHECK THAT LANDING GEAR GROUND SAFETIES, INCLUDING WHEEL CHOCKS ARE IN POSITION. BEFORE APPLYING OR RELIEVING HYDRAULIC SYSTEM PRESSURE, MAKE CERTAIN THAT THE TRAVEL RANGES OF THE CONTROL SURFACES ARE CLEAR. BEFORE PRESSURIZING HYDRAULIC SYSTEMS, CHECK THAT ALL CONTROLS ARE SET TO CORRESPOND WITH THE ACTUAL POSITION OF THE SERVICES THEY OPERATE. BEFORE PROCEEDING WITH MAINTENANCE WORK ON OR NEAR MECHANICAL FLIGHT CONTROLS OR PRIMARY FLIGHT CONTROL SURFACES, LANDING GEARS, ASSOCIATED DOORS OR ANY MOVING COMPONENT, MAKE CERTAIN THAT GROUND SAFETIES AND/ OR WARNING NOTICES ARE IN CORRECT POSITION TO PREVENT INADVERTENT OPERATION OF CONTROLS. ITEM A. B. C.OU DESIGNATION Access Platform, 5.5 m (18 ft.) Warning Notices Rigging Pin - THS Actuator Mechanical Input Lever Page 1 of 12

2 ITEM THE FOLLOWING CHECK IS DEMANDED FOR TRIMMABLE HORIZONTAL STABILIZER ACTUATOR SERIE AND ONLY. D.OU E.OU THE FOLLOWING CHECK IS DEMANDED FOR TRIMMABLE HORIZONTAL STABILIZER ACTUATOR SERIE AND ONLY. F.98A G. H. THE FOLLOWING CHECK IS DEMANDED FOR TRIMMABLE HORIZONTAL STABILIZER ACTUATOR SERIE AND ONLY. J. DESIGNATION Tool - Brake Testing, THS Actuator Pin - Rigging, Spool Control Gear Box (Qty. 2) Panels - Floor, Fuselage Tail Section TORQUE Wrench up to 0.5 m.dan (45 lbf.in) Corrosion-Resistant Steel Lockwire, 0.6 mm (0.024 in.) dia. Corrosion-Resistant Steel Lockwire, 0.8 mm in.) dia. THE FOLLOWING CHECK IS DEMANDED FOR TRIMMABLE HORIZONTAL STABILIZER ACTUATOR SERIE AND ONLY. Packings THE FOLLOWING CHECK IS DEMANDED FOR TRIMMABLE HORIZONTAL STABILIZER ACTUATOR SERIE AND ONLY. K. Referenced Procedures - (Ref , P. Block 001) - (Ref , P. Block 301) - (Ref , P. Block 501) - (Ref , P. Block 401) Flight Controls Replenishing AC External Power Control Mechanical Control (THS) THS Actuator Hydraulic Motor , Main Hydraulic Power - Pressurization/ Depressurization - (Ref , P. Block 301) 3. Procedure WARNING: CHECK THAT LANDING GEAR GROUND SAFETIES, INCLUDING WHEEL CHOCKS ARE IN POSITION. BEFORE APPLYING OR RELIEVING HYDRAULIC SYSTEM PRESSURE, MAKE CERTAIN THAT THE TRAVEL RANGES OF THE CONTROL SURFACES ARE CLEAR. Page 2 of 12

3 A. Job Set-Up (Ref. Fig. 501) BEFORE PRESSURIZING HYDRAULIC SYSTEMS, CHECK THAT ALL CONTROLS ARE SET TO CORRESPOND WITH THE ACTUAL POSITION OF THE SERVICES THEY OPERATE. BEFORE PROCEEDING WITH MAINTENANCE WORK ON OR NEAR MECHANICAL FLIGHT CONTROLS OR PRIMARY FLIGHT CONTROL SURFACES, LANDING GEARS, ASSOCIATED DOORS OR ANY MOVING COMPONENT, MAKE CERTAIN THAT GROUND SAFETIES AND/ OR WARNING NOTICES ARE IN CORRECT POSITION TO PREVENT INADVERTENT OPERATION OF CONTROLS. (1) Position access platform and open access door 312AR. (3) Connect electrical ground power unit and energize the aircraft electrical network (Ref , P. Block 301). (4) Make certain that electronics racks ventilation is correct. (5) Pressurize hydraulic systems (Ref , P. Block 301). (6) Make certain that the following circuit breakers are closed: PANEL SERVICE IDENT. LOCATION 21VU 21VU 21VU 21VU 21VU 21VU 127VU 127VU FAC 1/28VDC FAC 1/115VAC FAC 1/26VAC FAC 2/26VAC FAC 2/115VAC FAC2/28VDC FLT CTL/SERVO CTL & THS/HYD SEL FLT CTL/SERVO CTL & THS/JAM DET THE FOLLOWING CHECK IS DEMANDED FOR TRIMMABLE HORIZONTAL STABILIZER ACTUATOR SERIE AND ONLY. 306CC1 309CC1 305CC1 305CC2 309CC2 306CC2 1CB 2CB 103/G 3 103/G 5 103/G 7 103/G 8 103/G10 103/G12 701/R64 701/R65 Page 3 of 12

4 (7) Move trimmable horizontal stabilizer (THS) to neutral position. (8) Depressurize hydraulic systems (Ref , P. Block 301). (9) Display warning notices in flight compartment prohibiting operation of pitch controls. (10) Install fuselage tail section floor panels P/N 98A B. Actuator synchronization check (Ref. Fig. 501) (1) Remove cap from manual-drive input to observe RH motor shaft rotation. (2) Pressurize green and yellow hydraulic systems (Ref , P. Block 301). (3) Make certain that G and Y pushbutton switches on SERVO CTL section of panel 428VU are pressed in (legends off). (4) Check motor shaft for absence of rotation. -if motor shaft rotates permanently without any input order to the HSA, a desynchronization is present which could have already damaged the hydraulic motors. Proceed with step 3. D. Motor shaft rotates few turns and stops, is an acceptable behaviour. Before further adjustment replace both hydraulic motors (Ref , P. Block 401). -if motor shaft does not rotate, proceed as follows: (5) Release G and Y pushbutton switch on SERVO CTL section of panel 428VU. (6) MAKE CERTAIN THAT 3/8 INCH SOCKET IS PROPERLY SECURED ON THE EXTENDER AND WILL NOT FALL INSIDE THE HSA CASING DURING CONNECTION/DISCONNECTION OPERATION. Page 4 of 12

5 Remove breather and install brake testing tool P/N OU to check LH motor shaft rotation. A 3/8 inch socket on a 150 mm (5.9 in.) extender may be used as alternative. (7) Press G and Y pushbutton switch on SERVO CTL section of panel 428VU. (8) DO NOT OPERATE THS ACTUATOR AT HIGH SPEED WHEN THE BRAKE TESTING TOOL P/N OU (OR EXTENDER/SOCKET) IS FITTED OR ACTUATOR IS NEAR THE UPPER OR LOWER STOPS. On horizontal stabilizer actuator, smoothly rotate mechanical input connecting shaft in the nose up direction (THS moves down) and determine which motor is running first. (9) Smoothly rotate mechanical input connecting shaft in the nose down direction (THS moves up) and check that same motor as determined in step (8) is running first and both motors rotate in same direction. -if not, the actuator is slightly desynchronized, proceed directly with adjustment procedure step 3. C. Synchronization is also achieved when the two hydraulic motors are starting at the same time in nose up or nose down, or in both direction. -if yes, the actuator is correctly synchronized. (10) Release G and Y pushbutton switch on SERVO CTL section of panel 428VU. (11) Remove brake testing tool P/N OU or 3/8 socket and extender. (12) Install breather. (13) Install cap on manual drive input. (14) Carry out functional test of trimmable horizontal stabilizer (Ref , P. Block 501). C. Adjustment procedure in case of slight desynchronization (Ref. Fig. 501) Slight desynchronization is present when the same motor is not starting first in nose up and nose down Page 5 of 12

6 direction when rotating smoothly the HSA mechanical input shaft. DURING THIS ADJUSTMENT ONLY THE RH ECCENTRIC MUST BE READJUSTED. THE LH ECCENTRIC MUST NOT BE ADJUSTED, IT IS USED AS REFERENCE FOR SYNCHRONIZATION ADJUSTMENT. (1) To gain access to RH transmission, proceed as follows: (2) (3) (a) (b) Cut and remove lockwire from RH protection sleeve (1). Screw protection sleeve (1) into protection sleeve (2) until thread disengages and slide protection sleeve (1) into protection sleeve (2), to gain access to eccentric (3). MAKE CERTAIN THAT 3/8 INCH SOCKET IS PROPERLY SECURED ON THE EXTENDER AND WILL NOT FALL INSIDE THE HSA CASING DURING CONNECTION/DISCONNECTION OPERATION. Remove breather and install brake testing tool P/N OU to check LH motor shaft rotation. A 3/8 in. socket on a 150 mm (5.9 in.) extender may be used as alternative. DO NOT OPERATE THS ACTUATOR AT HIGH SPEED WHEN THE BRAKE TESTING TOOL P/N OU (OR EXTENDER/SOCKET) IS FITTED OR ACTUATOR IS NEAR THE UPPER OR LOWER STOPS. On horizontal stabilizer actuator, smoothly rotate mechanical input connecting shaft in the nose up direction (THS moves down) and determine which motor is running first. (4) Smoothly rotate mechanical input connecting shaft in the nose down direction (THS moves up) and check that same motor as determined in step (5) is running first and both motor rotate in same direction. Synchronization is also achieved when the two hydraulic motors are starting at the same time in nose up or nose down, or in both direction. Page 6 of 12

7 -if not, slightly loose screw (4), slightly rotate RH eccentric and tighten screw (4). (5) Repeat steps (3) and (4), checking which motor is running first. (6) When the synchronization is correct, TORQUE screw (4) to between 0.3 and 0.4 m.dan (26.55 and lbf.in). (7) Safety screw (4) with lockwire 0.6 mm (0.024 in) dia. (8) On RH transmission coupling/drive shaft assembly slide protection sleeve (1) outwards, then screw out protection sleeve (2) until contacting THS actuator housing and safety with lockwire 0.8 mm (0.031 in.) dia. (9) Remove brake testing tool P/N OU or 3/8 socket and extender. (10) Install breather. (11) Install cap on manual-drive input. (12) Remove fuselage tail section floor panels P/N 98A (13) Carry out functional test of trimmable horizontal stabilizer (Ref , P. Block 501). D. Adjustment procedure in case of significant desynchronization (Ref. Fig. 501) Significant desynchronization is present in case a permanent rotation of the right hand hydraulic motor shaft is detected when the green and yellow hydraulic systems are pressurized without any input order to the HSA. At this stage, the motors should have already been replaced (Ref , P. Block 401). (1) With hydraulic systems pressurized (G and Y pushbutton switches on SERVO CTL section of panel 428VU are pressed in) manually move the actuator to neutral position until Page 7 of 12

8 rigging pin P/N OU can easily be installed in THS actuator input lever. (2) Release G and Y pushbutton switch on SERVO CTL section of panel 428VU and depressurize hydraulic systems. (3) Drain THS actuator oil (Ref , P. Block 001). (4) Cut and remove lockwire from mechanical stops (5). (5) Remove mechanical stops (5), discard packings (6) and install rigging pins P/N OU in spool control gearbox outputs. (6) To gain access to LH and RH transmission, proceed as follows: (a) (b) Cut and remove lockwire from RH and LH protection sleeve (1). Screw protection sleeve (1) into protection sleeve (2) until thread disengages and slide protection sleeve (1) into protection sleeve (2), to gain access to sliding shaft (7). DO NOT DEFORM TRANSMISSION COUPLING (8) WHEN RETRACTING SLIDING SHAFT (7). (7) Disconnect RH sliding shaft (7) from yoke hinge (9) as follows: (a) Cut and remove lockwire from screw (10). (b) Loosen screw (10) and retract sliding shaft (7) into coupling (11) against spring (12). (c) Tighten screw (10) to hold sliding shaft (7) in the retracted position. (8) On RH side of the THS actuator (green system) slightly untighten screw (10) so that sliding shaft (7) is pushed out by spring (12). (9) Check that the sphere on the valve block control shaft is properly centered and engaged in the recess of sliding shaft (7) and that the fork of sliding shaft (7) fits to eccentric (3). - if yes, the RH valve block is considered at neutral position. -TORQUE screw (10) to between 0.3 and 0.4 m.dan (26.55 and lbf.in) and safety with lockwire 0.6 mm (0.024 in.) dia. Page 8 of 12

9 Would a slight rotation of the valve block input shaft/sliding shaft /fork be necessary to fit to the eccentric, it would cause a spool valve offset and THS actuator desynchronization: -if not, proceed as follows: (a) (b) (c) (d) Unscrew again screw (10) and retract sliding shaft (7). Tighten screw (10) to hold sliding shaft (7) in retracted position. Slightly untighten screw (4) to allow free rotation of the eccentric (3). Untighten screw (10) so that sliding shaft (7) is pushed out by spring (12). (e) -check that the eccentric positioning is achieved by the fork of sliding shaft (Self aligning the eccentric). -if not, slightly rotate the eccentric so that the fork of sliding shaft (7) freely fits the eccentric. TORQUE screws (4,10) to between 0.3 and 0.4 m.dan (26.55 and lbf.in) and safety with lockwire 0.6 mm (0.024 in.) dia. (10) Repeat procedure in step (6) and (9) on the LH side. (11) Remove rigging pins P/N OU from spool control gearbox outputs. (12) Fit new packings (6) to mechanical stops (5). (13) Install mechanical stops (5) and secure with lockwire 0.8 mm (0.032 in.) dia. (14) Remove rigging pin P/N OU (15) Replenish THS actuator oil (Ref , P. Block 001) (16) MAKE CERTAIN THAT 3/8 INCH SOCKET IS PROPERLY SECURED ON THE EXTENDER AND WILL NOT FALL INSIDE THE HSA CASING DURING CONNECTION/DISCONNECTION OPERATION. Page 9 of 12

10 (17) Remove breather and install brake testing tool P/N OU to check LH motor shaft rotation. A 3/8 inch socket on a 150 mm (5.9 in.) extender may be used as alternative. DO NOT OPERATE THS ACTUATOR AT HIGH SPEED WHEN THE BRAKE TESTING TOOL P/N OU (OR EXTENDER/SOCKET) IS FITTED OR ACTUATOR IS NEAR THE UPPER OR LOWER STOPS. On horizontal stabilizer actuator, smoothly rotate mechanical input connecting shaft in the nose up direction (THS mover down) and determine which motor is running first. (18) Smoothly rotate mechanical input connecting shaft in the nose down direction (THS moves up) and check that same motor as determined in step (6) is running first and both motors rotate in same direction. Synchronization is also achieved when the two hydraulic motors are starting at the same time in nose up or nose down, or in both direction. DURING THIS ADJUSTMENT ONLY THE RH ECCENTRIC MUST BE READJUSTED. THE LH ECCENTRIC MUST NOT BE ADJUSTED ANYMORE AS IT IS NOW USED AS REFERENCE FOR SYNCHRONIZATION ADJUSTMENT. -if not, loose screw (4), slightly rotate RH eccentric (3) and tighten screw (4). (19) Repeat steps (17) and (18), checking which motor is running first. (20) Release G and Y pushbutton switch on SERVO CTL section of panel 428VU. (21) When the synchronization is correct TORQUE screw (4) to between 0.3 and 0.4 m.dan (26.55 and lbf.in) and safety with lockwire 0.6 mm (0.024 in.) dia. (22) On both transmission coupling/drive shaft assembly slide protection sleeve (1) outwards, then screw out protection Page 10 of 12

11 sleeve (2) until contacting THS actuator housing and safety with lockwire 0.8 mm (0.031 in.) dia. (23) Remove brake testing tool P/N OU or 3/8 socket and extender. (24) Install breather. (25) Install cap on manual drive input. (26) Remove fuselage tail section floor panels P/N 98A (27) Carry out functional test of trimmable horizontal stabilizer (Ref , P. Block 501). E. Close-Up (1) Remove fuselage tail section floor panels P/N 98A (2) Make certain that working area is clean and clear of tools and miscellaneous items of equipment. (3) Close access door 312AR. (4) Remove access platform. (5) De-energize the aircraft electrical network (Ref , P. Block 301) and disconnect electrical ground power unit. Page 11 of 12

12 Figure 501 Figure 501. Valve Blocks Synchronization(Sheet 1) Page 12 of 12