CFM56 Engine Stand Tie-down Guide .pdf

1 CFM56 down process | Prestwick | 08th Sept 2015 ver 1.01 Presentation title | Location | xx month 20xx

CFM56 ENGINE STAND

TIE-DOWN GUIDE

2 CFM56 down process | Prestwick | 08th Sept 2015 ver 1.0

PURPOSE

To ensure the correct tie down points are utilized during road transport of the CFM56 series engines to prevent main bearing damage to the engine.

Identify and recognize the two component parts of the cradle.

Aid origin, transit and destination to gain confidence in handling aero-engines safely and efficiently.

Ensuring that while lifting with Forklift the engine fan case is not damaged by the mast of the forklift.

Ensure that the correct lifting equipment and trailer is used.

Provide example of good tie down practice on standard aircraft ULD.

3 CFM56 down process | Prestwick | 08th Sept 2015 ver 1.0

TYPICAL ENGINE STAND

It is worth noting that there are several engine stand manufacturers who have approval to design and construct engine cradles however the tie down principles are identical for each.

The sole purpose being that the straps or chains do not compromise the shock absorption ability of the rubber mounts installed between the lower and top sections of the stand.

Upper section

Rubber shock absorbers

Lower section

4 CFM56 down process | Prestwick | 08th Sept 2015 ver 1.0

STAND WITH ENGINE LOADED

The below picture is typical stand with engine already loaded. It is worth noting that this engine has no exhaust outlet installed

5 CFM56 down process | Prestwick | 08th Sept 2015 ver 1.0

RUBBER SHOCK ABSORBER (MOUNT)

The following picture is of the shock absorber and typical location on the stand.

Please note they can be in varying places on the stand but will be present on all stand types. It is important to identify these so you are sure that no straps or chains are secured to the section mounted above these absorbers.

Note the rubber mount

6 CFM56 down process | Prestwick | 08th Sept 2015 ver 1.0

SIDE DOWN POINTS

These are the tie down points on the side of the stand. Different manufactures have different amounts but there will be a minimum of 2 on each side.

7 CFM56 down process | Prestwick | 08th Sept 2015 ver 1.0

FRONT TIE DOWN POINTS

On the front of the engine (where the fan case is located) there are 2 tie down points. 1 on either side of the cradle. Take care that the chains or straps are not of such a degree that they connect with the engine fan case itself.

Note that the straps are only attached to the base stand and not the inner cradle

8 CFM56 down process | Prestwick | 08th Sept 2015 ver 1.0

REAR TIE DOWN POINTS

Similar to the front the rear has 2 tie down points also 1 on either side of the cradle.

There is a possibility that the tie down rings are actually drilled holes in the lower frame.

Again note the positions of the straps

This is the inner cradle.

DO NOT SECURE

HERE

9 CFM56 down process | Prestwick | 08th Sept 2015 ver 1.0

LOADING ENGINE ONTO TRAILER/DOLLY

The standard cradles do not allow lifting by overhead crane or gantry and therefore are more apt for lifting by a suitable forklift. Great care must be exercised when engaging with the engine to prevent contact between the fan case and the forklift mast. The engine will naturally settle against the mast when tilting back. Please have the operator stop short of full engagement to the mast by approx. 10 inches/25cms.

The forklift must be capable of lifting the weight of the engine at 48inch/122cm centres to the height of the trailer plus 12 inches/30cms. Please consult with forklift manufacturers instruction book

The trailer must be AIR-RIDE and if enclosed should be large enough to prevent contact with the engine fan housing at the top. Consider origin and delivery point loading restrictions to determine best trailer option.

Engines moved on a non air-ride trailer, transfer dolly or forklift cannot exceed the speed of 5mph/8kph or possible damage to the bearings may result.

10 CFM56 down process | Prestwick | 08th Sept 2015 ver 1.0

LOADING ENGINE ONTO TRAILER CONTINUED

Picture of trailer identifying AIR-RIDE suspension units

11 CFM56 down process | Prestwick | 08th Sept 2015 ver 1.0

Strap is only over lower half of cradle

Pictures clearly identifying that lower half of stand below shock absorbers are secured

The above picture is how to secure the stand should there be no tie down rings available to attach the strap to. This is last resort.

12 CFM56 down process | Prestwick | 08th Sept 2015 ver 1.0

Please refer to slide 7 and 8 regarding the securing to front and rear of the engine stands

13 CFM56 down process | Prestwick | 08th Sept 2015 ver 1.0

AIRLINE TIE DOWN PROCESS

This section is only applicable if you are the export or transit point.

It is vital that NO straps or Nets are put over the engine or in direct contact with the engine as this WILL damage the fragile attachments on the side and top of the engine.

Where the airline is also proposing a truck sector we have already identified this is the highest risk to damage as we cannot control how they secure the engine to the truck. Review the truck tie down process with them and ensure they will be compliant.

Request the airline provide pictures of the tiedown on a trailer BEFORE the truck sets off.

14 CFM56 down process | Prestwick | 08th Sept 2015 ver 1.0

AIRCRAFT PALLET TIE DOWN

All airlines overall objective is to ensure the safety of the aircraft, passengers and cargo.

There is no picture available for the CFM56 being loaded on an aircraft pallet however, the principle is the same. While it is understood that securing stands via the inner cradle itself will not cause damage while in flight, movement of same while on a ramp dolly will certainly do.

As such airlines should comply with the request to secure only to the lower part of the stand (beneath the shock mounts) any strap/lashing that is secured to the top half of the stand (inner cradle) must be applied once on the aircraft or removed/released on offload prior to the ramp transfer.

15 CFM56 down process | Prestwick | 08th Sept 2015 ver 1.0

IF IN DOUBT, DO NOT PROCEED

DO NOT proceed if you cannot identify tie down points on the LOWER point of the cradle.

DO NOT proceed if the trailer is not AIR-RIDE as identified as shown in slide 10

DO NOT proceed if the hauler hasn’t the necessary amount of straps. Minimum 8 straps unless chains are used, then it is a minimum 4 chains.

DO NOT proceed if you cannot identify the rubber shock absorbers (x4 sets) separating the top and bottom sections of the engine stand.

DO NOT proceed unless you have a direct truck from shipper to airline or from airline to consignee.