The main piece of equipment described in the manual is the Passenger Stair 88″ – 161″, which is identified as Model 15F2820 Passenger Stairway.

The Manufacturer is CLYDE MACHINES INC.. The company’s address is P.O. BOX 194, GLENWOOD, MN 56334, with a telephone number of (320) 634-4504.

The specific Manufacturer Date for an individual unit is Not Available in the sources. However, the owner’s manual itself was initially Issued 5/13/2010 and subsequently revised on 5/3/2012, 6/19/2014, and 6/12/2015. Furthermore, certain components or structural assemblies were changed on specific dates relative to serial numbers.

The specific Serial Number of the unit associated with this manual is Not Available. However, the sources indicate that structural changes to the bottom frame assembly (15F2833) were applied to units with serial numbers after 67271 (effective 6/19/2014). There was also a change in step hole spacing (5/26/2015): 12-1/2″ spacing applied to serial numbers before 70500, and 12-11/16″ spacing applied to serial numbers after 70501.

The Working Hours for any specific unit are Not Available in the sources. The manual provides detailed maintenance schedules, such as greasing major pivots every 6 months, oiling pivot points every 90 days, and checking hydraulic oil annually. It is also noted that the battery should be charged after each usage.

Regarding Condition / Operational Status, the equipment is a maintenance stand that was lubricated and adjusted at the factory prior to shipment. The manufacturer’s warranty covers goods found defective under “normal use and service” within one year from the date of shipment. To determine its ongoing fitness, load testing is recommended every 5 years or after a “significant damage event and subsequent repairs”. This suggests criteria for assessing its condition, but the current operational status (operational or refurbished) of a particular unit is Not Specified.

A specific Plate Photo (of the identification/data plate) is Not Available in the sources. However, the manual includes several placards (labels) related to the unit, such as the PLACARD, HYDRAULIC OIL, PLACARD, ELEC. SYSTEM, and the PASS. STAIR WEIGHT PLACARD.

Major Component Details

The illustrated parts catalogue also lists major sub-assemblies and components which constitute additional equipment items:

• CYLINDER, PASSENGER STAIR: Part Number 15O5890, Quantity 1.
• DUAL ACTING PUMP: Part Number 15O4446, Quantity 1. This component is operated by a PUMP HANDLE (15L6779).
• BATTERY CHARGER: Part Number 15O5884, Quantity 1. This component uses a 110-volt source for charging.
• BATTERY GROUP 24 D.C.: Part Number 15O5928, Quantity 1.
• RELAY, TIMER: Part Number 15O5897, Quantity 1. This relay controls the lighting operation, which can be adjusted from one to 120 minutes.
• ELEC. HYDRAULIC PUMP: This is an optional component (part of the 15F3093 Optional Electric/Hydraulic System), Part Number 15O6069, Quantity 1.
• SOLAR PANEL: This is an optional component (part of the 15F2958 Optional Solar Battery Charger), Part Number 15O6077, Quantity 2.

Manufacturer Date:2018 .

Serial Number: 86449.

Working Hours : Not Available.

Condition Refurbished

The equipment detailed in the owner’s manual is the Model 15F2820 Passenger Stairway, manufactured by Clyde Machines, Inc..

Here are the technical details and specifications available for this equipment:

General Specifications and Capabilities

• Model Number: 15F2820.

• Function: Passenger Stair.

• Operating Height Range: 88 inches to 161 inches.

• Wind Stability: The stand is stable throughout its full range of motion in winds up to 78 miles per hour. Overturning motion begins once this wind speed is reached.

Hydraulic System Details

The stairway is raised and lowered using a hydraulic system that includes a Dual Acting Pump (Part No. 15O4446) and a Passenger Stair Cylinder (Part No. 15O5890).

• Fluid: Hydraulic oil must be Mobil DTE-11 or equivalent.

• Capacity: The hydraulic tank capacity is 2.5 gallons.

• Level Check: The hydraulic oil level should be checked annually; it should be no more than 1-1/2 inches down from the top of the hydraulic tank when the stand is in its lowest position.

• Filter: The hydraulic filter cartridge (Part No. 15O3050) must be replaced annually.

Operationally, raising the stair involves actuating the hand pump until the stairs are slightly above the desired platform height, then lowering the stair via the needle valve until the safety locks engage in the platform support struts. Lowering requires using the hand pump to disengage the safety locks, then pulling back and holding the release handle while opening the needle valve.

Electrical and Lighting System

The equipment includes a dedicated electrical system featuring battery power and charging components:

• Battery: Uses a Battery Group 24 D.C. (Part No. 15O5928).

• Charging: The battery should be charged after each use by connecting to a 110-volt source. The charger (Part No. 15O5884) can be left connected indefinitely without causing overcharging. A completely drained battery will fully charge in approximately 8 hours.

• Indicator: Battery condition can be monitored using a gauge on the side of the box, provided the 110v charger cord is disconnected for accuracy.

• Circuit Protection: A 15 AMP Circuit Breaker (Part No. 15O5921) is included in the electrical box.

• Lighting Timer: The onboard lights (LED Lamps, Part No. 15O5885) are on a timer that automatically shuts them off after a pre-set period. This timer can be adjusted from one to 120 minutes by accessing the timer relay (Part No. 15O5897) inside the battery box.

Maintenance and Testing Requirements

Specific timelines and technical procedures are defined for maintenance:

• Lubrication: Major pivots should be greased every 6 months using the provided grease zerks. Pivot points should have a few drops of oil applied every 90 days to prevent binding.

• Wheel Maintenance: The wheels should be removed and the hub bearings repacked with grease annually.

• Load Testing: It is recommended that the stand be load tested every 5 years or following significant damage and subsequent repairs. This test requires placing a load twice the rated load on the center of the platform while the stand is adjusted to its lowest position.

Bolt Torque Specifications

The manual provides torque values for Grade 5 Fine Thread (SAE) fasteners, specified in LB.-FT (Pound-Feet):

To raise the massive wings of an aircraft (representing its operational capability), this passenger stair requires the precise and regular application of hydraulic fluid and electrical power, much like a well-oiled machine needs routine technical care to function smoothly under demanding conditions.