Forum: F-16 Procedures

You need to define the problem more clearly if you want some good suggestions. You mention that the CADC light comes on during FLCS BIT. At what step does the CADC light come on? Is there a CADC MFL 003 along with the light? Is the CADC fail at Step 4 of the FLCS self-test? If so, are you watching the HUD to see that the altitude goes to 2000 feet and airspeed to 250 knots? If you do not perform FLCS BIT, does the light come on by itself at some point? Have you performed an AOA probe rotation check? Have you boresighted the aircraft after MLU mod? And last but not least, have you gotten your Lockheed Tech Rep involved? If not, what are you waiting for?

Best Regards,

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thank you joe for your concern

iam sory maybe i couldnt clear the problem as required

we position main power to main

wait 8-10 sec CADC caution light came on and never goes out after RESETTING
the flcs bit stop at step 13 with mfl 003 at that time the cadc caution light stay on
we didnt have any problem at step 4 so that we didnt watch the HUD
and as i said befor the CADC caution light came after 8-10 sec since the main power positioned to main and still on during the BIT and the BIT stop at step 13
the self test doesnt pass clearly yet
the aircraft not porsighted yet
we perform the AOA rotation check and its ok and also we checked th all wiring between AOA and CADC the result is pass ,
one of member said to check the wiring between CADC and ENGINE and i ask him about the relation and if you can answer me too about that ,

I HOPE I CAN CLEAR THE PROBLEM BETTER NOW AND GLAD TO ANSWER ANY QUSTION

safeside wrote:

koraydemir wrote:

check the cadc to engine wiring. cadc sends mach signal to engine any short to ground would illunumate the caution!

in fact we didnt start engine yet, the jet just modefied , and we have to pass al ops checks befor starting engine ,

for cadc problem we didnt check the links between the engine and the cadc , can you pleas guide me how to reach the wiring or the schematic

waiting for you

you dont need start the engine just check the p300 connector on engine pins related cadc for any contamination and short to ground! for correct pin number consult your 34 fi! if you have 34fi itod send it to me i can tell you related pin numbers!

additionally check the total temp probe shorted or open,
aoa to aoa indicator,
vvi to vvi indicator and eca,

[quote="safeside"]

koraydemir wrote:

check the cadc to engine wiring. cadc sends mach signal to engine any short to ground would illunumate the caution!

Well if that was the case there should also be a "ENG MACH FAIL" PFL present.

koraydemir wrote:

safeside wrote:

koraydemir wrote:

check the cadc to engine wiring. cadc sends mach signal to engine any short to ground would illunumate the caution!

in fact we didnt start engine yet, the jet just modefied , and we have to pass al ops checks befor starting engine ,

for cadc problem we didnt check the links between the engine and the cadc , can you pleas guide me how to reach the wiring or the schematic

waiting for you

you dont need start the engine just check the p300 connector on engine pins related cadc for any contamination and short to ground! for correct pin number consult your 34 fi! if you have 34fi itod send it to me i can tell you related pin numbers!

additionally check the total temp probe shorted or open,
aoa to aoa indicator,
vvi to vvi indicator and eca,

thank you very much

i have 34 fi and i can trak the needed pin
i well try then i ll told you about the result

i hope we can solve this problim

thank you for your concerning again

[quote="BouliNDSO"]

safeside wrote:

koraydemir wrote:

check the cadc to engine wiring. cadc sends mach signal to engine any short to ground would illunumate the caution!

Well if that was the case there should also be a "ENG MACH FAIL" PFL present.

but they didnt start the engine!

If you consistently have a failure during BIT, take your Viper MLV and run the AFLCS diagnostics. Connect the Viper (or EDNA) and run your FLCS self-test. The software will tell you which bits failed and even which wires to shoot! Get off the CADC light and work the FLCS self-test failure. Use the Viper MLV!

Best Regards,

what about the result Safeside?

Enthusiast Joined: Oct 03, 2007 - 03:10 PM Posts: 23

I'm not all that familiar with Blk 15's (or MLU), but I believe you are saying you have a CADC 003? If so, have you checked all your power going to the CADC? If CADC isn't getting proper power, it won't talk to the FCC (or equivalent) on either bus. Also, is this a 1 seater or 2 seater? If its a 2 seater, I believe a backseat airdata line leak can cause a 003. Good luck!

Have you tried the IMSC yet??? I know it is a long shot but have personally seen this cause the elusive CADC 003 MFL (26VAC "Altitude Good" signal goes right through this component)

Hi guys,

i would like to thank all of you , i use all your notes i gain more experiance by this post , really iam glad and a would like to thank you everyone by his name buy iam care i dontlike to forget anybody

we solve the hard problem after 18 days of cont work , after we lose all hopes to finde the reasons of the caution light , the problem was clear just once we replaced the alt, even we try that twice by BRAND NEW altimeter but our bad luck is the both replaced alt was not servecible , we contact the manufacturere aout that , they checked them and they found them U\S

THANK YOU ALL

troubleshooting on the internet........Jesus Christ hope that MLU´s dont fly here often....

Forum: F-16 Procedures

CADC caution light always on?