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Search: Posts Made By: S4Simon
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Forum: Engineers & Technicians
24th Feb 2023, 09:34
Replies: 41
Views: 14,402
Posted By S4Simon

Well it's really dead. In that I don't remember...

Well it's really dead. In that I don't remember seeing a unit that dead before. Usually there's some's signs of life even if for just a millisecond. But there's nothing. Sometimes if there is a...
Forum: Engineers & Technicians
6th Feb 2023, 22:35
Replies: 41
Views: 14,402
Posted By S4Simon

This is a very big moment. Remember when...

This is a very big moment.

Remember when power (specifically 115vac 400hz) is first supplied to the unit (before switching the MSU on) there'll be a high pitched whining noise from the back of the...
Forum: Engineers & Technicians
29th Jan 2023, 08:15
Replies: 41
Views: 14,402
Posted By S4Simon

The power pin outs are the same for all LTN-72s...

The power pin outs are the same for all LTN-72s and LTN-92 INUS

115VAC 400hz (Primary Power) 5 amps
High - J1B Pin 1
Common - J1B Pin 2

115Vac 400Hz (Heater Power) 10 amps
High - J1B Pin 3...
Forum: Engineers & Technicians
25th Jan 2023, 21:50
Replies: 41
Views: 14,402
Posted By S4Simon

Minimal current needed for the 28v. This is...

Minimal current needed for the 28v. This is really only required as a safety interlock for initialisation. It needs to see that 28v is present so that if 115 is lost in flight it can survive on the...
Forum: Engineers & Technicians
23rd Jan 2023, 23:36
Replies: 41
Views: 14,402
Posted By S4Simon

Initialization of the INU. The INU...

Initialization of the INU.



The INU goes thru a number of statuses in order to complete a full alignment.

Status 90: MSU to STBY, Power applied to gimbal, heaters. Gimbal is forced into a...
Forum: Engineers & Technicians
22nd Jan 2023, 22:46
Replies: 41
Views: 14,402
Posted By S4Simon

Well that's weird. Missing one of the D/A...

Well that's weird. Missing one of the D/A boards. The other missing board is not an issue. The board above the Mode board is an optional board (Radio Navigation Interface board - RNI). Not...
Forum: Engineers & Technicians
22nd Jan 2023, 04:13
Replies: 41
Views: 14,402
Posted By S4Simon

Another note of caution. The unit like to run...

Another note of caution. The unit like to run hot. In that the gimbal assembly requires a lot of heat to keep the gyros happy. The front of the unit will be quite hot to touch, whereas the rear of...
Forum: Engineers & Technicians
21st Jan 2023, 22:38
Replies: 41
Views: 14,402
Posted By S4Simon

With regard to the hidden BITE indicators, they...

With regard to the hidden BITE indicators, they can be found behind the smaller black circuit board side cover, found just under the power supply which you removed in the pic above. 9 or so screws to...
Forum: Engineers & Technicians
21st Jan 2023, 22:24
Replies: 41
Views: 14,402
Posted By S4Simon

I wouldn't be too worried about the excess...

I wouldn't be too worried about the excess friction in the gimbal. The excess friction would cause high drift on long flights. Something that you will not be doing.

The main priority is to get...
Forum: Engineers & Technicians
21st Jan 2023, 22:13
Replies: 41
Views: 14,402
Posted By S4Simon

With regard to the Boscombe Down cct board mod. ...

With regard to the Boscombe Down cct board mod. I have not seen this on any unit before, so this unit must have been their test bed. I did help the guys at Boscombe Downs a few times in their...
Forum: Engineers & Technicians
21st Jan 2023, 22:06
Replies: 41
Views: 14,402
Posted By S4Simon

The bias figures are not readable. My best guess...

The bias figures are not readable. My best guess for the GBX,GBY, GBZ values are: GBX: 7770 3600 GBY: 0015 2200 GBZ: 0010 0000. For info bias figures are between 7765 0000 and 0024 0000. ...
Forum: Engineers & Technicians
15th Jan 2023, 23:35
Replies: 41
Views: 14,402
Posted By S4Simon

The CDU in the pics above is a 72 variant - all...

The CDU in the pics above is a 72 variant - all good there. The MSU is a LTN-92 variant - has the amber align light rather than the green ready nav light which can be found on the LTN-72 MSUs. No...
Forum: Engineers & Technicians
14th Jan 2023, 22:48
Replies: 41
Views: 14,402
Posted By S4Simon

Hi Erik, I stumbled across this forum today...

Hi Erik,

I stumbled across this forum today looking for LTN-72 INS pics. I was actually about to create a video on disassembling the LTN-72 Platform.

I have 30+ years experience on the 72...
Showing results 1 to 13 of 13


 
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