Mechanics, aircraft jacks are vital for maintenance on your helicopter. They’ve been around for years and gone through a lot of changes. Some have been put out to pasture while others have been neglected.
Now, that won’t be a problem anymore because we told you on Pages 27-30 of PS 760 (Mar 16), how to maintain your jacked up jacks.
With all the changes, sometimes it’s difficult to determine which jack is used for which aircraft task. No longer. Here’s a list of the maintenance tasks that require jacks and how many to use:
NOTE: These are typical tasks which require the aircraft to be placed on jacks. Please ensure you follow TM 1-1520-Longbow/Apache (IETM) for specific requirements, size, placement, warnings, cautions, and notes for all jacks.
- Jacking aircraft, 3 point, using a tripod jack requires two 5-ton jacks, NSN 1730-00-516-2018, and one 3-ton jack, NSN 1730-00-734-9382. The Fuselage adapter, NSN 1560-01-226-7551, will also be used.
- Jacking aircraft, 2 point, using a tripod jack requires two 5-ton jacks, NSN 1730-00-516-2018. The Fuselage adapter, NSN 1560-01-226-7551, will also be used.
- Jacking tail landing gear using a tripod jack requires one 3-ton jack, NSN 1740-00-734-9382.
- Jacking the main landing gear, 1 point, using an axle jack requires one 5-ton jack, NSN 1740-00-540-2343. Chinook
- Note that Apache is the only helicopter airframe that uses the 5-ton jack, NSN 1730-00-516-2018.
- Jacking an entire Chinook requires two 12-ton jacks, NSN 1730-00-912-3998, and two 10-ton jacks, NSN 1730-00-203-4697. As an alternative method, you can use two 12-ton jacks, NSN 1730-00-912-3998, and one 10-ton jack, NSN 1730-01-563-7046.
- Replacing the forward right- or left-hand gear assembly requires one 10-ton jack, NSN 1730-01-563-7046. However, the aircraft weight must be below 24, 500 pounds.
- Replacing the forward right- or left-hand tire assembly requires one 10-ton jack, NSN 1730-203-4697.
- Replacing the aft right- or left- hand gear assemblies requires one 12-ton jack, NSN 1730-00-912-3998.
- Replacing the aft right- or left- hand tire assembly requires one 12-ton jack, NSN 1730-00-912-3998.
- Weighing aircraft using load cells (3 point) with a max gross weight of 24,500 pounds requires two 12-ton jacks, NSN 1730-00-912-3998, and one 10-ton jack, NSN 1730-01-563-7046.
- Weighing aircraft using load cells (4 point) with a max gross weight of 33,000 pounds requires two 12-ton jacks, NSN 1730-00-912-3998, and two 10-ton jacks, NSN 1730-00-203-4697.
- A/C Model Kiowa Warrior
- Jacking an entire OH-58A/C requires three 12-ton jacks, NSN 1730-00-912-3998.
- D-Model Kiowa Warrior
- Jacking an entire OH-58D requires three 12-ton jacks, NSN 1730-00-912-3998. Black Hawk Aircraft
- NOTE: When a Kiowa is on jacks, use an overhead hoist or cable support to maintain the aircraft. This is done as a safety precaution in the event a strong wind gust blows through the hangar and knocks the Kiowa off the jacks.
- Jacking requires three 12-ton jacks, NSN 1730-00-201-4849.
- Removal and installation of the right- and left-hand landing gear shock strut requires one 12-ton jack, NSN 1730-00-201-4849.
- Jacking the right- and left-hand main landing gear wheel and tire assembly requires one 10-ton jack, NSN 1730-00-203-4697.
- Removal and installation of the tail landing gear shock strut requires one 12-ton jack, NSN 1730-00-201-4849.
- Removal and installation of the tail landing gear wheel and tire assembly requires one 10-ton jack, NSN 1730-00-203-4697.
- Weighing the helicopter using load cells (3 point) requires three 12-ton jacks, NSN 1730-00-201-4849.
- Changing a flat tire or collapsed strut requires one 12-ton jack, NSN 1730-00-201-4849, or one 10-ton jack, NSN 1730-00-912-4697.
- Changing a flat tail tire or collapsed gear strut requires one 12-ton jack, NSN 1730-00-201-4849, and one 10-ton jack, NSN 1730-00-912-4697.
- Lakota Aircraft
- Jacking an entire UH-72A aircraft takes four jacks. The type of jack is not specified, but two 12-ton tripod jacks, NSN 1730-00-912-3998, and two 10-ton landing gear jacks, NSN 1730-00-203-4697, work well.
- Weighing the Lakota requires three jacks. The type of jack is not specified, but one 12-ton tripod jack, NSN 1730-00-912-3998 and two 10-ton landing gear jacks, NSN 1730-00-203-4697 work well.
Mechanics, your Chinooks come with primary covers for different parts of the aircraft. You’ll find these covers listed in the TMs.
In case you don’t have the primary covers on hand, the Chinook headshed has provided three approved alternate covers for the pitot tube, the T-714 engine, and the rotor head:
|Pitot tube cover||01-645-1206|
|T-714 engine maintenance cover||01-646-0357|
|Rotor head maintenance cover||01-646-0358|
These covers come from a third party source and the NSNs won’t be added to the TMs, so make a note. If you order the covers, you have the option of a free, three-part, on-site training session from the manufacturer. To arrange for the training, contact:
Shield Technologies Corporation
The three part training covers:
- information about the unique anti-corrosion cover technology and how it benefits your aircraft and equipment.
- hands-on training to properly install, remove and care for the covers.
- a CD with written instructions on how to properly install, remove and care for the covers.
The CD also helps train new Soldiers and provides refresher training.
The training prevents damage to aircraft, components and equipment, while extending the life of the covers. Primary Cover NSNs
Here’s a list of the primary covers for the Chinook. Keep this as a handy reference.
|1||Engine exhaust cover||01-593-9707||CH-47-202|
|2||Forward rotor head cover||01-593-9690||CH-47-063|
|3||FWS XMSN oil inlet cover||01-593-9716||CH-47-068|
|Aft rotor hub cover||01-593-9723||CH-47-064|
|4||Hyd/oil cooler exhaust vent cover set||01-593-9684||CH-47-067|
|5||APU tail cone exhaust cover||01-593-9515||CH-47-150|
|6||Center console set cover||01-593-9662||CH-47-127|
|7||Air inlet and oil cooler exhaust cover||01-593-9697||CH-47-124|
|8||Cockpit enclosure (windshield and nose)||01-593-9636||CH-47-128|
|9||Aircraft engine right-hand cover||01-593-9359||CH-47-060|
|10||Aircraft engine left-hand cover||01-539-9488||CH-47-059|
Note: Both 9 and ten depict covers designed for two configurations, one with and one without the external air particle separator (EAPS) and engine exhaust installed.
The manufacturer of these covers will also provide hands-on training if requested.
The POC is:
Mechanics, straining to reach the top of the aft rotor head while standing on the aft support platform of your Chinook is a real stretch.
You can get some relief with the aft rotor pylon step (ARPS).
The ARPS is especially helpful when you have to remove, service or install the aft rotor head. Without the ARPS, you don’t have a step up. That means you have to guide the crane and remove all the components before the rotor head can be removed. Problem is, you’ll be doing this work while reaching overhead in a position that is uncomfortable for both tall and short mechanics, not to mention having to work in tight spaces.
The aft rotor pylon step will give you a step up so you can perform maintenance tasks in a more natural standing position. Keep these safety points in mind when using the ARPS:
• An ARPS should be attached to the aircraft with each hook firmly seated on the cap structure of the WL 119 deck. Its base should rest firmly on the work platform for more support.
• An ARPS can be used on both sides of the aircraft at the same time.
• Because of limited space and for safety purposes, only one mechanic should be standing on each ARPS.
• The capacity of the stand is one mechanic, plus tools and equipment. However, total weight should not exceed 400 pounds.
Take this drawing to your welding shop and have them make the stand with high tensile steel.