DESCRIPTION
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ML50-20 MAINTENANCE LIFT
TESCO EQUIPMENT LLC
CHAPTER 1: GENERAL INFORMATION AND OPERATING INSTRUCTIONS
Section 1: Description
1. DESCRIPTION
The Tesco ML50-20 Maintenance Lift is designed to maintain and inspect aircraft.
The ML50-20 is a scissor hi-lift unit mounted on a commercial truck chassis with a minimum gross
vehicle weight (GVW) rating of 14,500 lb (6577 kg). The work platform operates from a minimum of 52.5
in (1.33 m) floor height up to a maximum 228 in (5.8 m) floor height. The maximum payload capacity is
3,000 lb (1361 kg).
The ML50-20 is designed and manufactured in full compliance with existing ANSI/SIA A92.2-2001,
ANSI/SIA A92.7-1998, SAE and OSHA safety standards.
2. MAJOR COMPONENTS
A. Chassis
Any commercially available truck chassis that meets the Gross Vehicle Weight (G.V.W.) rating,
and 120” of Cab to Axle (CA) dimension requirements can be used.
NOTE: Refer to the chassis manufacturer’s manual for further information.
B. Scissor Lift Unit
The ML50-20 consists of two single acting (power up/gravity down) telescopic hydraulic cylinders.
Each of the two (2) hydraulic cylinders is equipped with a positive locking safety holding valve,
which will stop and hold the hi-lift in a raised position.
C. Platform
The platform’s floor surface consists of grating. Three (3) safety harness restraint D-rings are
mounted in the floor. The folding side and socket mounted end safety handrails are 41 in (1.04
m)
hig
h and constructed of structural steel tubing. The platform has 99 ft
2
(9.2 m
2
) of working
surface. The perimeter outside edges are fitted with non-marking rubber bumpers to protect the
aircraft from any inadvertent contact.
D. Telescopic Stabilizers
Four (4) double acting telescopic stablizers are mounted to the lower scissor frame, two (2) on the
front of the frame and (2) on the back of the frame. The stabilizers are designed to deploy straight
down via double acting, hard industrial chrome-plated hydraulic cylinders, which are mounted
inside the stabilizer leg housing. Each stabilizer is equipped with a double, pilot operated safety-
holding valve, which safeguards the stabilizers from inadvertently retracting after being set or
extending while driving the vehicle.
NOTE: The Telescopic Stabilizers are not designed to lift the entire vehicle’s weight from the
ground. The stabilizers are designed to work in conjunction with the vehicle chassis
suspension during hi-lift operation.
May 08
Property of American Airlines
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