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The following is a description of Best Shop Pracices for a full Flap Slat Rig on a Astra, G100, and G150. At no point should this information supplant OEM work card information.

Download and print the Gulfstream work cards:
1. Slat Rigg…
2. Flap Rig….
3. ……

The current work flow on the Slat Rig ….is difficult to follow, and omits the important mechanical length check on the bench.

The following information also references the older grey handbook entitled “Astra…….”

RAC all surfaces to extend.

Follow Gulfstream instructions to remove slats, flaps, and fixed LE covers. Remove 1 end of each drive cable from each jackscrew and PDU.

remove the jackscrews for Bench check length measurement. See Appendex 1.

Reinstall jackscrews

Check overrotation angles, see Appendex 2: Set #3 MECHANICAL UP DOGSTOP ….

Support lollypos with rods extended to the floor.

Rack all actuators to retract.

Lube all cables if applicable.

Do not connect drive cables to PDU. DO NOT RUN THE SLATS with the leading edge covers removed!, the trailing edge of the slat can hook the upper wing surface and damage WILL occur.

Remove actuators, measure on bench, at retract position. Adjust lollypop.

Install actuators

Set outboard actuators to retract dog stop voltage. turn lollypos to full retract dog stop position. Vertical within 5 degrees? if not, cut safety wire and adjust lollypos to vertical. Safety wire.

Measure actuator retracted length again.

if within specs, support reinstall and support jackscrews.

Remove C1 to allow brake release.

Brake release. 9 1/2 turns out for slats by speed handle. 24 out for flaps. !!!!!!! turn brake release off!!!!!!!!!!

Verify PDU is DISCONNECTED from inboard drive cables.

Connect C1

RAC PDU down a little, then up tp UP ELECTRICAL stop.

Connect inboard cables to PDU.

Be sure the Jackscrews are supported, and CANNOT touch the wing internal fuel cups.

RAC to full extend. this should drive all 6 actuators to full extend, just short of the dog stops.

Test degrees of over-rotation that is allowed to get to the dog stop. the inboards should be 45(?) degrees from dog-stop.Appendex 1
middle should be 60(?) degrees from dog-stop
outboards should be 135(?) from dog-stop.

!!!!!IF!!!!! you have previously DOUBLE CHECKED the #3 jackscrew bench retract length, you can cut the safety wire and adjust the Lollypop to correct over-rotation angle.

The # 1 and #2 Jackscrew input drives can be twisted easily to obtain the EXACT over-rotation angle.

This is an opportune time to temporarily install the SLATS and check the slip fit of the 3 bolts. DO NOT RUN THE SLATS with the leading edge covers removed! The trailing edge of the slat can hook the upper wing surface and damage WILL occur. Remove the slats again.

Install fixed LE. Install Flap/Slat. If ANY one of the 3 jackscrew bolts is 1/2 hole off or worse: STOP WHAT YOU ARE DOING! You have missed something.

If the 3 bolts holes are slip fit, move forward. If you can flex the slat a MINOR amount, say 1/8 inch, and install the bolts,you can move forward.

DO NOT RUN THE SLATS with the leading edge covers removed!, the trailing edge of the slat can hook the upper wing surface and damage WILL occur.

One last check for tools clear, LE Panels installed, NOT ONE SINGLE SCREW RAISED ABOVE THE SURFACE!!!!!, All hardware installed on the slat mechanism. PDU Drive shafts connected, Obstructions clear from movement areas.

RAC to retract. recheck retract RAW RETRACT voltage. if these are .050 out or more….STOP WHAT YOU ARE DOING, you have missed something. Moving forward will result in a MIS-RIGGED airplane with excessive trimming on the electrical pots. Leading to future problems.

Check Conditioned retract voltage. Adjust the 10 turn pots on FSECU face to book value.

RAC to extend. Check conditioned extend voltage.

Check intermediate voltages, and flap angles.

Appendex 1: Bench Check the length of each actuator:

Appendex 2: Set #3 MECHANICAL AND ELECTRICAL UP DOGSTOP position , Adjust #1, and #2 UP DOGSTOP position

Appendex 3: Set 9 1/2 turns on slat, 24 turns on flap: