We replaced all 8 connectors.

 

 

 

 

 

 

Luis

Aeropainting

972 757 8980

 

 

 

 

Pycharm

pycharm-community in the command for the gui

 

 

 

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:

 

 

 

 

 

 

 

Winxp only

 

 

 

Bring dump card and clean  data card. Smaller than 256mb. Formated fat 16. .( FAT)

 

Pull cb reer d3

 

Door will not open till power off

 

Eject card

Insert dump. Leave door open. Push cb Be paitient.

Wait for complete light.

Pull cb

Insert empty data card.

Expect CHECK MDAU nuisance message.

Win xp explorer to copy to compuTer folder

 

USE MDAU_READOUT 7.0

 

 

 

FORMAT one.

 

Make one dump.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Current as of Nov 1 2025:

Bus A has sawtooth only when DCU1 breaker pushed.

Bus B has sawtooth only when DCU 2 breaker pushed.

Here is failure mode, showing shorter, sawtooth pulses:

Here is non-failed mode, square pulses:

Very infrequently, the sawtooth will be very pronounced.

We have been warned the the pulses must be 3.5v Peak to Peak.  Our good pulses show 3.1v, and the runt pulses from the DCU show 2.1v. Some inaccuracy expected because we are using a 6 foot scope probe, off of a bus tap mid string.  If we sampled at the terminator, both  would be slightly higher?

Here is the original F900 ASCB topology, with Universal pin numbers annotated.

 

 

??=====================================

Current as of  oct 31, 2025

The frequent un-commanded disengage comes with LAFCS FAIL, and B16: Servo interface monitor fail on the bit codes

Occasional IRU DATA INVALID.

Occasional Disengage ANN data fault

Not sure about this one:

Initial problem.

AP transfers, AP uncommanded disconnect random, only in flight. MTRIM and YD disconnect most of the time.

 

+++++++++++++++++++++++++++++++++++++++++++++++++

Older printable data:

34-09-01-A.S.C.B WIRING 3

34-09-01-A.S.C.B WIRING page 1 34-09-01-A.S.C.B WIRING page 2

 

adsb fms for sn 009

ascb2

ascb 1

ASCB cropped 3 pages

ASCB cropped 3 pages Printable

ASCB Measurements

ASCB RING OUT 1021

ASCB RING OUT TEMPLATE

 

 

 

 

 

 

 

 

 

Free pickup drop off 76078

 

Mark Patnode

2146976225

 

A and P , was IA.

 

 

 

 

We elected to section and discarded the old 90 degree backshells.  That allowed enough slack to define, repin, one wire