Functional Check of Free-fall Mechanism Cable Tension

TASK 32-33-00-200-001-A
Functional Check of Free-fall Mechanism Cable Tension

WARNING: PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:

THE FLIGHT CONTROLS
THE FLIGHT CONTROL SURFACES
THE LANDING GEAR AND THE RELATED DOORS
COMPONENTS THAT MOVE.

MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.

WARNING: MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.

ZONE: 100

1. Reason for the Job
Refer to the MPD TASK: 323300-04
FUNCTIONAL CHECK OF FREE-FALL MECHANISM CABLE TENSION

NOTE: You can use the Cable Tension Tables in this task for the aircraft with Weight-on-Wheels or Aircraft-on-Jacks.

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	CABLE TENSIOMETER
No specific	1	ROD - NON METALLIC
No specific	AR	SAFETY BARRIER(S)
No specific	AR	WARNING NOTICE(S)
No specific	7	WEDGE - NON METALLIC
98A27003001000	1	RIGGING PIN
98A27801001000	1	RIGGING PIN
98A27901002000	1	PIN-RIGGING,RUDDER CONTROL
98DNSA20208060	2	RIGGING PIN

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
100	LOWER HALF FUSELAGE INCLUDING RADOME
211FF, 212GF, 241EF, 241LF, 242FF, 242LF, 734, 744, 822, 825
131NC
131BC
131DC, 232JG
232LF

C. Referenced Information

REFERENCE	DESIGNATION
TASK 25-21-41-000-001-A	Removal of the Passenger Seats
TASK 25-21-41-400-001-A	Installation of the Passenger Seats
TASK 25-54-12-000-002-A	Removal of the Ceiling Panels in the Forward Cargo Compartment
TASK 25-54-12-400-002-A	Installation of the Ceiling Panels in the Forward Cargo Compartment
TASK 32-00-00-481-001-A	Installation of the Safety Devices on the Landing Gears
TASK 32-12-00-010-001-A	Open the Main Gear Doors for Access
TASK 32-12-00-410-001-A	Close the Main Gear Doors after Access
TASK 32-22-00-010-001-A	Nose Gear Doors - Ground Doors Opening
TASK 32-22-00-410-001-A	Nose Gear Doors - Ground Doors Closing
TASK 32-33-00-820-001-A	Adjustment of the NLG Free-Fall Extension Cable System
TASK 32-33-00-820-003-A	Adjustment of the MLG Free-Fall Extension Cable System
TASK 52-30-00-860-001-A	Open the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
TASK 52-30-00-860-002-A	Close the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
TASK 53-12-11-000-001-A	Removal of the Cockpit Floor Panels from FR1 thru FR12
TASK 53-12-11-400-001-A	Installation of the Cockpit Floor Panels from FR1 thru FR12
TASK 53-22-12-000-001-A	Removal of the Cabin Floor Panels
TASK 53-22-12-400-001-A	Installation of the Cabin Floor Panels
TASK 53-32-12-000-002-A	Removal of the Cabin Floor Panels
TASK 53-32-12-400-002-A	Installation of the Cabin Floor Panels
Cockpit and Cabin Floor Panels
Cabin Floor Panels
Forward Cargo-Compartment Access Panels ** ON A/C NOT FOR ALL
Forward Cargo-Compartment Access Panels ** ON A/C NOT FOR ALL
Forward Cargo-Compartment Access Panels ** ON A/C NOT FOR ALL
Free-Fall Cable System ** ON A/C NOT FOR ALL
Free-Fall Cable System ** ON A/C NOT FOR ALL
NLG and MLG Cable-Tension Graph
MLG-Bay Cable-Tension Graph - Weight on Wheels
MLG-Bay Cable-Tension Graph - Weight on Jacks

3. Job Set-up
Subtask 32-33-00-941-052-A

A. Safety Precautions
(1) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.
(2) Make sure that the ground safety locks are on the landing gear (Ref. AMM TASK 32-00-00-481-001).
(3) On panel 400VU:

Make sure that landing-gear control-lever 6GA is in the DOWN position
Put the WARNING NOTICE(S) in position to tell persons not to operate the landing gear.

(4) On panel 11VU, make sure that the GRAVITY GEAR EXTN handle is folded into the center console.
(5) Install a WEDGE - NON METALLIC on each side of the GRAVITY GEAR EXTN handle to lock the handle in position.

Subtask 32-33-00-010-050-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the NLG doors (Ref. AMM TASK 32-22-00-010-001).
(2) Make sure that a 98D32203502000 SAFETY PIN - NLG DOOR is installed in each NLG door.
(3) Open the MLG doors 734 744 (Ref. AMM TASK 32-12-00-010-001).
(4) Make sure that the 460005835 SLEEVE - GROUND LOCK is on the applicable MLG door actuator.
(5) Open the lateral avionics-compartment door 822.
(6) Open the forward cargo-compartment door 825 (Ref. AMM TASK 52-30-00-860-001).
(7) Remove the forward cargo-compartment ceiling panel 131BC (Ref. AMM TASK 25-54-12-000-002).
(8) Remove the cockpit floor panels 211FF 212GF (Ref. AMM TASK 53-12-11-000-001).
(9) Remove the applicable passenger seats to get access to the floor panels 232LF 241EF 241LF 242FF 242LF (Ref. AMM TASK 25-21-41-000-001).
(10) Remove the passenger-compartment floor panels 232LF 241EF 241LF 242FF 242LF (Ref. AMM TASK 53-22-12-000-001) and (Ref. AMM TASK 53-32-12-000-002).

Subtask 32-33-00-010-050-B ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the NLG doors (Ref. AMM TASK 32-22-00-010-001).
(2) Make sure that a 98D32203502000 SAFETY PIN - NLG DOOR is installed in each NLG door.
(3) Open the MLG doors 734 744 (Ref. AMM TASK 32-12-00-010-001).
(4) Make sure that the 460005835 SLEEVE - GROUND LOCK is on the applicable MLG door actuator.
(5) Open the lateral avionics-compartment door 822.
(6) Open the forward cargo-compartment door 825 (Ref. AMM TASK 52-30-00-860-001).
(7) Remove the forward cargo-compartment ceiling panel 131NC (Ref. AMM TASK 25-54-12-000-002).
(8) Remove the cockpit floor panels 211FF 212GF (Ref. AMM TASK 53-12-11-000-001).
(9) Remove the applicable passenger seats to get access to the floor panels 232LF 241EF 241LF 242FF 242LF (Ref. AMM TASK 25-21-41-000-001).
(10) Remove the passenger-compartment floor panels 232LF 241EF 241LF 242FF 242LF (Ref. AMM TASK 53-22-12-000-001) and (Ref. AMM TASK 53-32-12-000-002).

Subtask 32-33-00-010-050-D ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the NLG doors (Ref. AMM TASK 32-22-00-010-001).
(2) Make sure that a 98D32203502000 SAFETY PIN - NLG DOOR is installed in each NLG door.
(3) Open the MLG doors 734 744 (Ref. AMM TASK 32-12-00-010-001).
(4) Make sure that the 460005835 SLEEVE - GROUND LOCK is on the applicable MLG door actuator.
(5) Open the lateral avionics-compartment door 822.
(6) Open the forward cargo-compartment door 825 (Ref. AMM TASK 52-30-00-860-001).
(7) Remove the forward cargo-compartment ceiling panels 131BC 131DC (Ref. AMM TASK 25-54-12-000-002).
(8) Remove the cockpit floor panels 211FF 212GF (Ref. AMM TASK 53-12-11-000-001).
(9) Remove the applicable passenger seats to get access to the floor panels 241EF 241LF 242FF 242LF (Ref. AMM TASK 25-21-41-000-001).
(10) Remove the passenger-compartment floor panels 232JG, 241EF 241LF 242FF 242LF (Ref. AMM TASK 53-22-12-000-001) and (Ref. AMM TASK 53-32-12-000-002).

Subtask 32-33-00-010-050-I ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the NLG doors (Ref. AMM TASK 32-22-00-010-001).
(2) Make sure that a 98D32203502000 SAFETY PIN - NLG DOOR is installed in each NLG door.
(3) Open MLG doors 734 744 (Ref. AMM TASK 32-12-00-010-001).
(4) Make sure that the 460005835 SLEEVE - GROUND LOCK is on the applicable MLG door actuator.
(5) Open lateral avionics-compartment door 822.
(6) Open forward cargo-compartment door 825 (Ref. AMM TASK 52-30-00-860-001).
(7) Remove forward cargo-compartment ceiling panel 131BC (Ref. AMM TASK 25-54-12-000-002).
(8) Remove cockpit floor panels 211FF 212GF (Ref. AMM TASK 53-12-11-000-001).
(9) Remove applicable passenger seats to get access to the floor panels 241EF 241LF 242FF 242LF (Ref. AMM TASK 25-21-41-000-001).
(10) Remove passenger-compartment floor panels 241EF 241LF 242FF 242LF (Ref. AMM TASK 53-22-12-000-001) and (Ref. AMM TASK 53-32-12-000-002).

Subtask 32-33-00-480-051-A

C. Installation of the Rigging Pins

Free-Fall Cable System ** ON A/C NOT FOR ALL

(1) Put in the 98A27801001000 RIGGING PIN at position Pin 1.
(2) Put in the 98A27003001000 RIGGING PIN at position Pin 2.
(3) Put the 98DNSA20208060 RIGGING PIN at positions Pin 3 and Pin 4.
(4) Put in the 98A27901002000 PIN-RIGGING,RUDDER CONTROL at position Pin 5.
(5) Make sure that the pins lock the related pulley, cable quadrant or lever.

4. Procedure

CAUTION: MAKE SURE THAT THE FREE-FALL EXTENSION CABLES ARE ADJUSTED CORRECTLY. INCORRECT ADJUSTMENT OF THE CABLES CAN CAUSE THE FREE-FALL EXTENSION SYSTEM TO BE UNSERVICEABLE.

Subtask 32-33-00-220-050-A

A. Functional Check of the NLG Free-Fall Mechanism Cable Tension
(1) Get the ambient temperature and the temperature of the underfloor areas.

NOTE: The ambient temperature is the air temperature external to the fuselage.

(2) Make a plot of the ambient and underfloor temperature points on the graph and find the correct tension value.

NLG and MLG Cable-Tension Graph

NOTE: Where the points of the ambient temperature and the underfloor temperature align (between the given lines of the tension), then the correct tension indication is calculated by the linear extrapolation. (See the example on the graph).

NLG and MLG Cable-Tension Graph

(3) Attach the CABLE TENSIOMETER to one of the cables at position A in the lateral avionics compartment, zones 127 and 128. Make sure that the tensiometer is attached a minimum of 80 mm (3.150 in.) away from the pulleys and the turnbuckles.

Free-Fall Cable System ** ON A/C NOT FOR ALL

NOTE: The free-fall extension cables have a diameter of 3.2 mm (0.126 in.).

(4) Compare the tensiometer indication with the tension value on the graph for the known ambient and the underfloor temperatures. The value must be in the adjustment range given on the graph.

NLG and MLG Cable-Tension Graph

(5) If necessary, adjust the tension in the cable (Ref. AMM TASK 32-33-00-820-001).
(6) Remove the tensiometer from the cable.
(7) Do steps (1) thru (6) again for the other NLG cable.

Subtask 32-33-00-220-051-A

B. Functional Check of the MLG Free-Fall Mechanism Cable Tension
(1) Do a check of the tension of the MLG free-fall extension cable at position B as follows:
(a) Get the ambient temperature and the temperature of the underfloor area.

NOTE: The ambient temperature is the air temperature external to the fuselage.

(b) Make a plot of the ambient and the underfloor temperature points on the graph and find the correct tension value.

NLG and MLG Cable-Tension Graph

(c) Attach the tensiometer to one of the cables at position B in the forward cargo compartment, zones 131 and 132. Make sure that the tensiometer is attached a minimum of 80 mm (3.150 in.) away from the pulleys and the turnbuckles.

Free-Fall Cable System ** ON A/C NOT FOR ALL

NOTE: The free-fall extension cables have a diameter of 3.2 mm (0.126 in.).

(d) Get five tensiometer indications from the same position on the cable. Use the middle value indication for the procedure in step (1) (e). You can ignore the two lowest and the two highest indication values.
(e) Compare the tensiometer indication with the tension value on the graph for the known ambient and the underfloor temperatures. The value must be in the adjustment range given on the graph.

NLG and MLG Cable-Tension Graph

(f) If necessary, adjust the tension in the cable (Ref. AMM TASK 32-33-00-820-003).
(g) Remove the tensiometer from the cable.
(2) Do step (1) again for the other MLG cable at position B.
(3) Do a check of the tension of the MLG free-fall extension cable at position C as follows:
(a) Get the ambient temperature.

NOTE: The ambient temperature is the air temperature external to the fuselage.

(b) Make a plot of the ambient temperature point on the graph and find the correct tension value:

For weight on wheels
MLG-Bay Cable-Tension Graph - Weight on Wheels
For weight on jacks.
MLG-Bay Cable-Tension Graph - Weight on Jacks

(c) Attach the tensiometer to one of the cables at position C in the wing center box, zone 241. Make sure that the tensiometer is attached a minimum of 80 mm (3.1496 in.) away from the pulleys and the turnbuckles.

Free-Fall Cable System ** ON A/C NOT FOR ALL

NOTE: The free-fall extension cables have a diameter of 3.2 mm (0.1260 in.).

(d) Compare the tensiometer indication with the tension value on the graph for the known ambient temperatures. The value must be in the adjustment range given on the graph.

For weight on wheels
MLG-Bay Cable-Tension Graph - Weight on Wheels
For weight on jacks.
MLG-Bay Cable-Tension Graph - Weight on Jacks

(e) If necessary, adjust the tension in the cable (Ref. AMM TASK 32-33-00-820-003).
(f) Remove the tensiometer from the cable.
(4) Do step (3) again for the other MLG cable at position C.
(5) Do a check of the tension of the MLG free-fall extension cable at position D as follows:
(a) Get the ambient temperature.

NOTE: The ambient temperature is the air temperature external to the fuselage.

(b) Make a plot of the ambient temperature point on the graph and find the correct tension value:

For weight on wheels
MLG-Bay Cable-Tension Graph - Weight on Wheels
For weight on jacks.
MLG-Bay Cable-Tension Graph - Weight on Jacks

(c) Attach the tensiometer to one of the cables at position D in the wing center box, zone 242. Make sure that the tensiometer is attached a minimum of 80 mm (3.150 in.) away from the pulleys and the turnbuckles.

Free-Fall Cable System ** ON A/C NOT FOR ALL

NOTE: The free-fall extension cables have a diameter of 3.2 mm (0.126 in.).

(d) Compare the tensiometer indication with the tension value on the graph for the known ambient temperatures. The value must be in the adjustment range given on the graph.

For weight on wheels
MLG-Bay Cable-Tension Graph - Weight on Wheels
For weight on jacks.
MLG-Bay Cable-Tension Graph - Weight on Jacks

(e) If necessary, adjust the tension in the cable (Ref. AMM TASK 32-33-00-820-003).
(f) Remove the tensiometer from the cable.
(6) Do step (5) again for the other MLG cable at position D.

Subtask 32-33-00-080-050-A

C. Removal of the Rigging Pins

Free-Fall Cable System ** ON A/C NOT FOR ALL

(1) Remove the 98A27801001000 RIGGING PIN at position Pin 1.
(2) Remove the 98A27003001000 RIGGING PIN at position Pin 2.
(3) Remove the 98DNSA20208060 RIGGING PIN at positions Pin 3 and Pin 4.
(4) Remove the 98A27901002000 PIN-RIGGING,RUDDER CONTROL at position Pin 5.
(5) On panel 11VU, remove the WEDGE - NON METALLIC from the GRAVITY GEAR EXTN handle.

Subtask 32-33-00-710-051-A

D. Operation of the Free-Fall Extension System

CAUTION: MAKE SURE THAT THE RIGGING PINS ARE REMOVED BEFORE OPERATION OF THE FREE FALL SYSTEM. DAMAGE WILL OCCUR IF THE RIGGING PINS ARE INSTALLED DURING SYSTEM OPERATION.

(1) Operate the free-fall extension system ten full cycles to let the cables and linkages become stable:
(a) For one full cycle, on panel 11VU:
1 Turn the GRAVITY GEAR EXTN handle clockwise three turns at a rate of one turn in five seconds
2 Turn the GRAVITY GEAR EXTN handle counterclockwise three turns at a rate of one turn in five seconds.
(2) Lock the GEAR GRAVITY EXTN handle:
(a) Put the handle in the stowed position.
(b) Install a WEDGE - NON METALLIC at each side of the GRAVITY GEAR EXTN handle to lock the handle in position.
(3) Do a visual inspection of the uplock hooks to make sure that they are in the fully open position:
(a) If necessary, use a ROD - NON METALLIC (or an equivalent tool) to move the uplock hooks to the fully open position. Do not use force to put the uplock hooks in the fully open position.

Subtask 32-33-00-480-061-A

E. Installation of the Rigging Pins

Free-Fall Cable System ** ON A/C NOT FOR ALL

Subtask 32-33-00-220-053-A

F. Functional Check of the NLG Free-Fall Mechanism Cable Tension
(1) Do a check of the NLG free-fall extension cable tension again, as specified in paragraph 4 A.

Subtask 32-33-00-220-054-A

G. Functional Check of the MLG Free-Fall Mechanism Cable Tension
(1) Do a check of the MLG free-fall extension cable tension again, as specified in paragraph 4 B.

5. Close-up
Subtask 32-33-00-080-059-A

A. Removal of the Rigging Pins

Free-Fall Cable System ** ON A/C NOT FOR ALL

Subtask 32-33-00-410-050-A ** ON A/C NOT FOR ALL

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) On panel 11VU, remove the WEDGE - NON METALLIC from the GRAVITY GEAR EXTN handle.
(3) Install cockpit floor panels 211FF and 212GF (Ref. AMM TASK 53-12-11-400-001).
(4) Install passenger-compartment floor panels 232LF 241EF 241LF 242FF and 242LF (Ref. AMM TASK 53-22-12-400-001) and (Ref. AMM TASK 53-32-12-400-002).
(5) Install the passenger seats (Ref. AMM TASK 25-21-41-400-001).
(6) Install forward cargo-compartment ceiling-panel 131BC (Ref. AMM TASK 25-54-12-400-002).
(7) Close forward cargo-compartment door 825 (Ref. AMM TASK 52-30-00-860-002).
(8) Close lateral avionics-compartment door 822.
(9) Close the MLG doors (Ref. AMM TASK 32-12-00-410-001).
(10) Close the NLG doors (Ref. AMM TASK 32-22-00-410-001).

Subtask 32-33-00-410-050-B ** ON A/C NOT FOR ALL

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) On panel 11VU, remove the WEDGE - NON METALLIC from the GRAVITY GEAR EXTN handle.
(3) Install cockpit floor panels 211FF and 212GF (Ref. AMM TASK 53-12-11-400-001).
(4) Install passenger-compartment floor panels 232LF 241EF 241LF 242FF and 242LF (Ref. AMM TASK 53-22-12-400-001) and (Ref. AMM TASK 53-32-12-400-002).
(5) Install the passenger seats (Ref. AMM TASK 25-21-41-400-001).
(6) Install forward cargo-compartment ceiling-panel 131NC (Ref. AMM TASK 25-54-12-400-002).
(7) Close forward cargo-compartment door 825 (Ref. AMM TASK 52-30-00-860-002).
(8) Close lateral avionics-compartment door 822.
(9) Close the MLG doors (Ref. AMM TASK 32-12-00-410-001).
(10) Close the NLG doors (Ref. AMM TASK 32-22-00-410-001).

Subtask 32-33-00-410-050-D ** ON A/C NOT FOR ALL

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) On panel 11VU, remove the WEDGE - NON METALLIC from the GRAVITY GEAR EXTN handle.
(3) Install cockpit floor panels 211FF and 212GF (Ref. AMM TASK 53-12-11-400-001).
(4) Install passenger-compartment floor panels 241EF 241LF 242FF 242LF 232JG and 232JG (Ref. AMM TASK 53-22-12-400-001) and (Ref. AMM TASK 53-32-12-400-002).
(5) Install the passenger seats (Ref. AMM TASK 25-21-41-400-001).
(6) Install forward cargo-compartment ceiling-panels 131BC and 131DC (Ref. AMM TASK 25-54-12-400-002).
(7) Close forward cargo-compartment door 825 (Ref. AMM TASK 52-30-00-860-002).
(8) Close lateral avionics-compartment door 822.
(9) Close the MLG doors (Ref. AMM TASK 32-12-00-410-001).
(10) Close the NLG doors (Ref. AMM TASK 32-22-00-410-001).

Subtask 32-33-00-410-050-I ** ON A/C NOT FOR ALL

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) On panel 11VU, remove the WEDGE - NON METALLIC from the GRAVITY GEAR EXTN handle.
(3) Install cockpit floor panels 211FF and 212GF (Ref. AMM TASK 53-12-11-400-001).
(4) Install passenger-compartment floor panels 241EF 241LF 242FF and 242LF (Ref. AMM TASK 53-22-12-400-001) and (Ref. AMM TASK 53-32-12-400-002).
(5) Install the passenger seats (Ref. AMM TASK 25-21-41-400-001).
(6) Install forward cargo-compartment ceiling-panel 131BC (Ref. AMM TASK 25-54-12-400-002).
(7) Close forward cargo-compartment door 825 (Ref. AMM TASK 52-30-00-860-002).
(8) Close lateral avionics-compartment door 822.
(9) Close the MLG doors (Ref. AMM TASK 32-12-00-410-001).
(10) Close the NLG doors (Ref. AMM TASK 32-22-00-410-001).

Subtask 32-33-00-942-051-A

C. Removal of Equipment
(1) Remove the SAFETY BARRIER(S).
(2) Remove the WARNING NOTICE(S).
(3) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.10 from 2021] 2026.04.01 00:46:23 UTC