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could effectively deploy CAPS if required.
General Deployment Information
Deployment Speed
The maximum speed at which deployment has been demonstrated is
133 KIAS. Deployment at higher speeds could subject the parachute
and aircraft to excessive loads that could result in structural failure.
Once a decision has been made to deploy the CAPS, make all
reasonable efforts to slow to the minimum possible airspeed. However,
June 2007
10-6 Information Manual
Section 10 Cirrus Design
Safety Information SR22
if time and altitude are critical, and/or ground impact is imminent, the
CAPS should be activated regardless of airspeed.
Deployment Altitude
No minimum altitude for deployment has been set. This is because the
actual altitude loss during a particular deployment depends upon the
airplane’s airspeed, altitude and attitude at deployment as well as
other environmental factors. In all cases, however, the chances of a
successful deployment increase with altitude. As a guideline, the
demonstrated altitude loss from entry into a one-turn spin until under a
stabilized parachute is 920 feet. Altitude loss from level flight
deployments has been demonstrated at less than 400 feet. With these
numbers in mind it might be useful to keep 2,000 feet AGL in mind as a
cut-off decision altitude. Above 2,000 feet, there would normally be
time to systematically assess and address the aircraft emergency.
Below 2,000 feet, the decision to activate the CAPS has to come
almost immediately in order to maximize the possibility of successful
deployment. At any altitude, once the CAPS is determined to be the
only alternative available for saving the aircraft occupants, deploy the
system without delay.
Deployment Attitude
The CAPS has been tested in all flap configurations at speeds ranging
from Vso to Va. Most CAPS testing was accomplished from a level
attitude. Deployment from a spin was also tested. From these tests it
was found that as long as the parachute was introduced to the free air
by the rocket, it would successfully recover the aircraft into its level
descent attitude under parachute. However, it can be assumed that to
minimize the chances of parachute entanglement and reduce aircraft
oscillations under the parachute, the CAPS should be activated from a
wings-level, upright attitude if at all possible.
June 2007
Information Manual 10-7
Cirrus Design Section 10
SR22 Safety Information
Landing Considerations
After a CAPS deployment, the airplane will descend at less than 1700
feet per minute with a lateral speed equal to the velocity of the surface
wind. The CAPS landing touchdown is equivalent to ground impact
from a height of approximately 13 feet. While the airframe, seats, and
landing gear are designed to accommodate the stress, occupants
must be prepared for the landing. The overriding consideration in all
CAPS deployed landings is to prepare the occupants for the
touchdown in order to protect them from injury as much as possible.
Emergency Landing Body Position
The most important consideration for a touchdown with CAPS
deployed is to protect the occupants from injury, especially back injury.
Contacting the ground with the back offset attempting to open a door
or secure items increases the likelihood of back injury. All occupants
must be in the emergency landing body position well before
touchdown. After touchdown, all occupants should maintain the
emergency landing body position until the airplane comes to a
complete stop.
The emergency landing body position is assumed with tightened seat
belt and shoulder harness by placing both hands on the lap, clasping
one wrist with the opposite hand, and holding the upper torso erect
and against the seat backs. The seat cushions contain an aluminum
honeycomb core designed to crush under impact to absorb downward
loads and help protect the spine from compression injury.
Door Position
For most situations, it is best to leave the doors latched and use the
time available to transmit emergency calls, shut down systems, and
get into the Emergency Landing Body Position well before impact. The
discussion below gives some specific recommendations, however, the
pilot's decision will depend upon all factors, including time to impact,
altitude, terrain, winds, condition of airplane, etc.
There is the possibility that one or both doors could jam at impact. If
this occurs, to exit the airplane, the occupants will have to force open a
partially jammed door or break through a door window using the
Emergency Exit Hammer located in the lid of the center armrest. This
　
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