2. The Propellers
Propeller A
Propeller B
Propeller B
Propeller A
The X4 aircraft uses 5.3-inch propellers. Each is marked with either an A or a B. Please
replace propellers if they are damaged.
1. Aircraft LED indicators
H216A has 4 LEDs; the fore/frontal LEDs are blue and the rear LEDs are red. The LED
status indications are defined as follows:
A p p e n d i x
Compass Calibration
Calib. Compass 1: all 4 LEDs flash clockwise
Calib. Compass 2: LEDs should be flashing in vertical pairs, alternately
Horizontal Calibration
Flight Mode
Low Power
How to turn off the LEDs
All 4 LEDs flash simultaneously
All 4 LEDs are solidly lit
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Blue LEDs (fore) are solidly lit; red LEDs (rear) will flash slowly
Blue LEDs (fore) are solidly lit; red LEDs (rear) flash rapidly
When recording and/or taking pictures, the throttle’s vertical trim button serves as
an on/off toggle for the LEDs
Function
Power on and start up
All 4 LEDs flash simultaneously
LED status indication
Flight control signal status
When the flight control signal is lost, the rear LEDs will stay solid while the fore
LEDs will slowly flash.
When the flight control signal is stable and connected, the LEDs will be solidly lit.
