(c) In wind conditions, calculate the permitted towing speed before towing:
R 1_ Measure the wind speed.
R 2_ Do a check of aircraft stability (Ref. TASK 05-57-00-200-001).
3_ Subtract measured wind speed from wind speed limit shown on the stability curve. This gives the maximum permitted towing speed.
(3) Approximate Towing Loads (Ref. Fig. 203/TASK 09-10-00-991-001)
R NOTE : In all the formulas, MTW = Maximum Taxi Weight.____
R R (a) When you push the aircraft rearward with the engines at idle, you must add the engine thrust resistance to the towing loads.
NOTE : The engine thrust resistance at ground idle is 400 daN____ (for each engine in operation).
(b) Use these coefficients for the friction between the tires of the tow tractor and the ground to calculate the minimum tractor weight: - Dry concrete or asphalt : 0.80 - Wet asphalt : 0.75 - Wet concrete : 0.57 - Hard snow : 0.20 - Ice : 0.05
6% MTW Minimum tractor weight = -----------------------(friction coefficient)
(4) Limit Loads and Angles (Ref. Fig. 204/TASK 09-10-00-991-002)
R R (a) In all the towing configurations, the safety pin locks the control lever on the interphone box in the disengaged position.
(b) The maximum permitted steering-angle on each side of the aircraft centerline is only 95 degrees.
(c) During towing, the towing angle must not be more than the angle shown on the FWD NLG doors.
NOTE : Step (c) is applicable for aircraft that have the wheel____ steering-angle marking on the FWD NLG doors.
R R (d) Tow the aircraft (slowly and smoothly) with the main landing gear: - the maximum towing angle in the vertical plane is 4 degrees, - the nose landing gear gives the limits for the maximum towing angle in the horizontal plane. (Ref. Fig. 205/TASK 09-10-00-991-004)
R R R R R (e) Use a towbar with: - the towing shear pins, calibration 9120 daN (20502.5716 lbf) for the protection of the landing gear against too high loads, - the safety shear pin, calibration 826 m.daN (6091.4453 lbf.ft) for the protection of the landing gear against too high torsion.
R R R R R (f) Use: - the two special fork fittings and a cable to tow the main landing gear forward or rearward. Attach these special fork fittings to the lugs at each end of the landing gear. - the safety shear pin, calibration 29000 daN (65194.5810 lbf) which comes with the two-fitting/cable set.
NOTE : When the engines are not installed, tow the aircraft____ smoothly.
NOTE : It is permitted to tow the aircraft with the floor panels____ of the cabin and/or cargo compartment(s) removed.
**ON A/C ALL
TASK 09-10-00-584-002
Towing with the Nose Gear from the Front
R NOTE : For aircraft with cabin and/or cargo compartment(s) floor panels
____ R removed, smooth and low-speed towing is recommended.
1. Reason for the Job
__________________
To push the aircraft rearward or tow the aircraft forward.
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
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REFERENCE QTY DESIGNATION
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No specific towbar
No specific tractor
D23156000 1 PIN
B. Referenced Information
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REFERENCE DESIGNATION
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05-57-00-200-001 Aircraft Stability 09-10-00-584-001 Towing 24-41-00-861-002 Energize the Aircraft Electrical Circuits from the
External Power 24-41-00-861-002 Energize the Aircraft Electrical Circuits from the APU 24-41-00-861-002 Energize the Aircraft Electrical Circuits from Engine 1(2) 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied from the External Power 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied from the APU 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2) 29-10-00-863-002 Pressurize the Yellow Hydraulic System
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REFERENCE DESIGNATION
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29-24-00-863-001 Pressurize the Yellow Hydraulic System with the
Electric Pump 31-60-00-860-001 EIS Start Procedure 32-00-00-481-001 Installation of the Safety Devices on the Landing
Gears
09-10-00-991-005 Fig. 206
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