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HomeRC & PowerAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › Futaba 401 not in HH
04-26-2009 09:16 PM  9 years agoPost 1
Alexander S H



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After severeal years with success my 401 suddenly is unable to go in Heading hold. Every possible variables is tryed out. It has been in 2 light crashes years ago.
Maybe the 401 has seen its end of days.
Has anyone experienced any similar problems?
Is gyro fatigue a possible factor?

04-26-2009 09:37 PM  9 years agoPost 2



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It wont go into HH unless it is INITIALIZED in HH. Be sure to check that.

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04-26-2009 09:41 PM  9 years agoPost 3


Cedar Rapids, IA

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Gyro fatigue? I doubt it. Something broken? More likely.

Quick way to test it:

Plug a normal servo into your receiver's gear channel (probably channel 5). Set the gear channel endpoints to 100 for both switch positions. Flip the gear switch, make sure the servo moves from one end to the other. This at least verifies that your gear switch makes the gear channel do what it it supposed to do. If it doesn't, then figure out how you've screwed up your TX so that it doesn't send the gear channel control to the RX.

When all works as it should with a servo plugged into the gear channel, unplug the servo from the RX gear channel. Plug your Gyro lead as you normally would into the rudder channel. Then, plug the gyro GAIN lead into the receiver's gear channel.

Turn things on, watch the red LED on the gyro. If it finally comes on solid, you're in HH mode. If it blinks slowly, you're not. Turn things off, flip the gear switch to the other position, turn things back on. Watch the red LED on the gyro.

If you can't get into HH mode with either switch position, then yes, your gyro is broken.


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04-28-2009 03:18 AM  9 years agoPost 4

rrKey Veteran

Sterling Heights, MI - USA

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If the above test fails, make sure the single yellow wire is on the signal side, not the ground side.

04-28-2009 09:39 AM  9 years agoPost 5
Alexander S H



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Thanks a lot.
Seems like have screwed up while converting to Fasst. Phu..
401 ok, and a 520 on its way.


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