AFDAU-T1 Aerial Firefighting
Data Acquisition Unit
Installation Manual
AMS-IM-1-01 Rev. 7
22 September 2021
4
1.3.4 Fill
The AFDAU-T1 will detect a Fill event when the selected container (refer Section 2.2.8), such as bucket, tank or
hopper, volume increases in a typical fashion which would be characteristic of that type of container. For this event to
be detected a volume gauge input must be connected to the AFDAU-T1 and properly configured, refer Section 2.2.10
The following additional data will be sent with the Fill event message:
Volume
This is the volume of water in the container at the end of the fill operation, being either picking up, or pumping in. This
value is in Litres.
Product Type
The product type message can be one of four attributes:
1. WATER
2. GEL
3. FOAM
4. RETARDANT
The product type defaults to WATER if no premix or additive inputs are detected or connected. A Premix Type (refer
Section 2.2.7) discrete input can be used to switch between WATER and RETARDANT filled.
If an active Additive Pump On (refer Section 2.2.7) discrete input is detected before the fill occurs, the product type is
set to either FOAM or GEL depending on the state of the Additive Select (refer Section 2.2.6) discrete input. If no
Additive Select input is connected when the Additive Pump On is detected the product type defaults to FOAM.
If the additive is added after the fill event, the AFDAU-T1 will send any injection of additive that may happen enroute to
the drop site with the Drop Start message, see Section 1.3.5. This would result in the Fill message product type being
WATER and the Drop Start message product type being either FOAM or GEL.
Container Type
The container type can be one of two attributes:
1. TANK
2. BUCKET
On single container aircraft, the container type is automatically detected and will reflect the container on which the fill
event was generated.
On dual container (bucket and tank) rotary-wing aircraft the container type is selected via a Container Select (refer
Section 2.2.8) discrete input.
