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6 Cards in this Set
- Front
- Back
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What is SAS and what does it do?
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1. The UH-60 incorporates two SAS systems to help maintain a stable platform in
flight. 2. SAS 1 is an analog system and SAS 2 is digital system. Both provide short term rate dampening in the pitch, roll, and yaw axes. 3. Operation of the two SAS is essentially the same. SAS 2 has self-diagnostic capabilities where SAS 1 does not. |
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How much input does SAS put on the flight controls?
Where does SAS gets it's flight inputs? |
1. Each SAS has 5% control authority for a combined total of 10%. If one fails the other doubles it's sesitivity but still just retains 5% authority.
2. Both SAS 1 and SAS 2 utilize hydraulic pressure from the #2 hydraulic system applied to a single SAS actuator for each of the three flight axes. The SAS actuators are located in the pilot-assist area beneath the over-head cowling. |
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What controls the SAS 1?
Where does SAS 1 get it's inputs from? |
1. SAS 1 is controlled by the SAS 1 amplifier located in the avionics compartment.
2. SAS 1 receives: * pitch signal from the #1 stabilator amplifier * roll signal from the pilot’s vertical gyro * yaw signal from an internal rate gyro |
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What controls the SAS 2?
Where does SAS 2 get it's inputs from? |
1. SAS 2 is controlled by the SAS/FPS computer located aft of the lower console.
2. SAS 2 receives: * Pitch signal from the #2 stabilator amplifier * Roll signal from a roll rate gyro * Yaw signal from a yaw rate gyro, co-located in an EMI hardened enclosure in the avionics compartment. |
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Indication of malfunction of SAS 1
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A malfunction of SAS 1 may be accompanied by “pounding” in the flight controls or erratic tip path plane movements.
There are no caution lights to indicate a failure of SAS 1 because SAS 1 is analog. If a SAS 1 failure is suspected, SAS 1 should be turned off. |
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Indication of malfunction of SAS 2
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SAS 2 utilizes a fault monitoring system to
alert the pilot of a failure. There are no caution lights associated with SAS 2, however, there are failure advisory capsule lights located on the AFCS panel. A SAS off caution light indicates that the SAS actuators are not pressurized. |
