Honeywell 880 manual Pitch and Roll Trim Adjustments Criteria

PRIMUSr 880 Digital Weather Radar System

Trim Adjustment	Flight Condition	Effect On Ground
		Return Display
		(Over Level
		Terrain)
Roll offset	Straight and level	Nonsymmetrical
		display
Pitch offset	Straight and level	Ground displays do
		not follow contour of
		range arcs.
Roll gain	Constant roll angle	Nonsymmetrical
	>20°	display
Pitch gain	Constant pitch angle	Ground displays do
	>5°	not follow contour of
		range arcs.

Generally, it is recommended to perform trim adjustments only if noticeable effects are being observed.

Pitch and Roll Trim Adjustments Criteria

Table 5- 4

NOTES: 1. Depending on the installation, not all of the adjustments shown in table 5- 4 are available. If STAB TRIM ENABLE programming strap is open, only the roll offset adjustment is available. If STAB TRIM ENABLE is grounded, all four adjustments are available. Consult the installation configuration information for details.

2.After any adjustment procedure is completed, monitor the ground returns displayed by the radar during several pitch and roll maneuvers. Verify that the ground returns stay somewhat constant during changes in aircraft orientations. If not, repeat the adjustment procedure.

3.After the trim adjustment feature is selected, more than one adjustment can be made. They are available in the sequence shown in table 5- 4, and can be done in the sequence of first finishing one adjustment, then proceeding to do the next by pushing the STAB button.

Radar Facts	A28- 1146- 102- 00
5-20