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lowering device on the
main line and belay line
systems, while permitting
a quick change to a
raising system without
switching out hardware.
Additionally the MPD
permits the main line and
belay line to be rigged as
mirrored systems with
the use of two devices.
The MPD meets the
British Columbia Council
of Technical Rescue
(BCCTR) Rescue Belay Figure 87- CMC Rescue MPD, 11mm Model illustrating
Competency Drop Test. nomenclature of parts. Original image © CMC Rescue.
Total weight of the device
is 1.2 kg (2 lb 10 oz).

The 11mm Model of the MPD (Model # 333010) is intended for use with 11mm (7/16
inch) static or low-stretch kernmantle rope. It is important to note that the use of CE
marked ropes, which may be 10.5mm in diameter, in contrast to 11mm ropes meeting
CI-1801 (Low Stretch and Static Kermantle Life Safety Ropes) can create operating
problems with the MPD. Performance issues with CE marked ropes being operated in
conjunction with rescue loads resulting in performance issues is not unique to the MPD,
54
and has occurred with the Petzl I’D as well . Be certain to use rope meeting the
diameter requirements of the device. Additionally, wet, icy or muddy ropes could
affect the proper function of the device, and additional friction may need to be applied
by the operator.

Prior to use the MPD should be inspected for any damaged, dirty or sticky components,
as well as excessive wear to the device.

To load the MPD, hold the device with the back plate facing up and rotate the back plate
allowing it to open (Figure 89). A diagram on the MPD itself shows how the rope should
be correctly loaded; observe the required rope requirements prior to opening and
rotating the side plate. It is important to verify that the rope enters and exits the device
exactly as intended and is not mis-threaded (Figure 90).

54 Mauthner, Kirk. Personal communication.

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