Fail-Safe Functions; Smartsafe; Receiver Power Only; After Connection - Spektrum Air Module System Manual

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Fail-Safe Functions

All of Spektrum's aircraft receivers feature a unique SmartSafe

while the AR9000 features two types of fail-safe: SmartSafe and preset fail-safe.

This type of fail-safe is especially ideal for most types of electric aircraft and is also

recommended for most types of gas- and glow-powered airplanes and helicopters.

Here's how SmartSafe works.

Note: The AR500 throttle fail-safe position is stored via the throttle stick

position on the transmitter.

When the receiver only is turned on (no transmitter signal is present), all servos

except for the throttle are driven to their preset fail-safe positions, normally control

surfaces at neutral and the landing gear down. These fail-safe positions are stored

in the receiver during binding. At this time the throttle channel has no output, to

avoid operating or arming the electronic speed control. In glow-powered models,

the throttle servo has no input so it remains in its current position.

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fail-safe system,

When the transmitter is turned on and after the receiver connects to the transmitter,

normal control of all channels occurs. After the system makes a connection, if

loss of signal occurs SmartSafe drives the throttle servo only to its preset fail-safe

position (low throttle) that was set during binding. All other channels hold their

last position. When the signal is regained, the system immediately (less than 4 ms)

regains control.

Note: The AR500 removes servo output pulses to all channels except the

throttle channel during fail-safe.

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