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munirabbasi

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Posts posted by munirabbasi

    C-130 Hercules Simulator

    in C-130 General

    Posted

    Hello  Sim Instructor /Engineer!

    Any  Herks Sim Instructor know  that Hercules training  simulator  sim programming are based on PLC or not. Which manufacture PLC is equiped with sim module. How  many bit are installed  on this  binary program i.e 64 bits or 32 bits.

    Best Regards

    Munir Abbasi

    Home Hercules Pakistan

    Generator Failure

    in C-130 Technical

    Posted

    3 hours ago, Kamrul Ahsan said:

    Sometimes Generator voltage travels from 120 to 125V, again comes back to 120V after 15-20minutes of flying. It is not fluctuations but slow travelling. Is there anything to worry about? Frequency always remains same, that is 400cps. 

    Kamrul Ahsan Sahib.  Type of GEN brushless or brush type? All ENG GEN? No load condition  of GEN Voltage may exceed to 125 V until  the voltage is regulated by VR , normally it  does not happened.Your defect belong to malfunctioning of VR or Excitation generator poles.check the voltage "A "point (PMG) VR terminal block 1 it should be 108 volts AC  (GE GEN) if Bendex type 30 V DC . If westinghouse GEN (Brush type) It has No PMG. than  "F" point to A  to-A  of VR (TB-1) 3.75 to 7.5 Vlots (GE), Bendex 30 Volt. If brush type (Westinghouse) check boost XFMRs are mounted F.S 245.

    image.png.e389858652372f93291f4c3164f2c2c8.png

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     Best Regards

    Munir Abbasi

    Home Of Hercules Pakistan

     

    Generator Failure

    in C-130 Technical

    Posted

    6 hours ago, Kamrul Ahsan said:

    Sir i was the student of urs in a Type maintenance course in Pakistan.. hope you remember. Sir apart from generator, what else i can check for such kind of failure. Like you said RGB vibration. Though i am not clear how to check the RGB vibration. 

    Dear Normal large scale vibration is display  RPM IND  thru tachometer generator. but a device is installed on ENGINE RGB  to display vibration of Engine /RGB parameters on Engine digital display unit ie EIDS.

    Best Regards

    Munir Abbasi

    Home of Hercules Pakistan

    Sequence of Engine Ground operation

    in C-130 General

    Posted

    10 hours ago, hehe said:

    Here is a C-130 flight manual for reference.

    This sequence started on A models because the GTC door had to be manually closed and the engine generators were split between inboard/outboard.   So they would start #3 and #4 and then shut down GTC, manually close the door and then start left wing.

    Some pubs mention starting engines in a different sequence than 3/4/2/1 to spread the wear and tear on engine starters.  The first engine started off of GTC/APU Bleed air will wear faster than the others with engine bleed air because of the higher flow/pressure from the engines.

    Generally speaking, if you 100% always start #3 first, data/trends say that you will replace the #3 engine starter before the other engines.

    20201219_130427.jpg

    Thanks tremendous response

    Is t SAFAR safety regulation by FAA Or USAF safety regulation ,any safety caution reference of TM or FM is available please mention the text

    Best Regards

    Munir Abbasi

    Home of Hercules Pakistan

    Generator Failure

    in C-130 Technical

    Posted

    17 hours ago, Kamrul Ahsan said:

    Sir what are the reasons and indications available for this type of problem? How to determine RGB vibration? How can i check if some other thing causing failure of generator bearing?

    My 30 year  experience say. that front bearing housing clearance more/or play between GEN end plate bearing housing and bearing. Change the GEN end plate. all GENs End PLATE  should be checked during phase inspection/ISO inspection

    2. Greasing must be carried out after three years  elapsed time if your using  ball bearing  of USAF standard.

    Best Regards

    Munir Abbasi

    Home Hercules Pakistan

    Generator Failure

    in C-130 Technical

    Posted

    3 hours ago, Kamrul Ahsan said:

    Hellow friends and brothers

    i just wanted to know what are the reasons behind the generator shaft bearing(only front) failure in C-130B ac with T56-A-7B engine.

    Due to  ENG RGB vibration.install GEN DISC System and Bearing failure system.

    Best Regards

    Munir Abbasi 

    Home of Hercules Pakistan

    EDP NYAB

    in C-130 Technical

    Posted

    4 hours ago, hehe said:

    1.  I will have to double check but I think the 3k RPM is low speed ground idle and 3.6K RPM is normal ground idle (engine at 100% rpm)

    Why would you ever need to figure out the GPM at low speed ground idle?  You would never fly at that engine RPM

    2.  Pressure equals out.  If you had 3K and 3.1K you would probably see a little bit above 3K by the time the pressure equalized and got to the pressure transmitter at the utility or booster panels.  Pressure drop is roughly 100 psi every 50 feet (not written down anywhere just what I have seen)

    Thanks for Marvelous response. Your services for Hercules operators will be  remember in godlessnesses wards forever.

    Munir Abbasi

    Home of Hercules Pakistan

     

    EDP NYAB

    in C-130 Technical

    Posted

    Hello Herks Hydra Expertise!

    1. It has mentioned Intermediate level maintenance T.O of  EDP NYAB  at 3000 RPM , flow rate of  pump is 6 GPM min, where pump is designed 10 GPM at 3650 RPM . when  both the pumps (NYAB) In Aircraft utility system  working parallel  max flow ie 16.93 pressure drop to 1800 psi. how  we can calculate flow rate (GPM) of both NYAB pumps when they are  working parallel at 3000 RPM?

    2 Just assume that  aircraft  hydraulic utility system ,when No 1 EDP pressure is 3000 psi and No.2 EDP pump pressure 3100 psi  how  the pressure act passes  thru passage of single pipe after isolation check valves ?

    Best Regrads

    Munir Abbasi

    Home Hercules Pakistan

     

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    C-130 EBH

    in C-130 Technical

    Posted

    Hello herks structure expertise

    If center wing is replaced with the wing of  500HRs  EBH Elapsed time What will be EBH of of the aircraft???

    Best Regards

    Munir Abbasi

    Home of hercules Pakistan

    UT Suction boost WX Light

    in C-130 Technical

    Posted

    10 hours ago, hehe said:

    Check the simple things

    Util reservoir filters (pressure return/case drains and reservoir vemt filter).  Something as simple as a wet vent filter can cause enough of a liquid lock that pump would cavitate during large draw such as landing gear movement.

    Swap the low pressure switch to booster side.   See if it follows the switch to booster side.

    Check the landing gear flow regulators.  Should be free flow toward motor and regulated away on both up/down lines.

    What was the util system pressure drop?  Did it drop below or around 1300 psi?

    Thanks for immediate response

    Oh! Flexible hose, mounted  bottom of reservoir was found  Collapsed

    Munir Abbasi

     

    10 hours ago, hehe said:

     

    Picture1.png

    UT Suction boost WX Light

    in C-130 Technical

    Posted

    9 hours ago, hehe said:

    Check the simple things

    Util reservoir filters (pressure return/case drains and reservoir vemt filter).  Something as simple as a wet vent filter can cause enough of a liquid lock that pump would cavitate during large draw such as landing gear movement.

    Swap the low pressure switch to booster side.   See if it follows the switch to booster side.

    Check the landing gear flow regulators.  Should be free flow toward motor and regulated away on both up/down lines.

    What was the util system pressure drop?  Did it drop below or around 1300 psi?

    Thanks for immediate response

    Oh! Teflon hose , mounted bottom of utility system reservoir was found kinked 

    Picture1.png

    UT Suction boost WX Light

    in C-130 Technical

    Posted

    3 hours ago, hehe said:

    Is this the same aircraft that was having these issues?  There was a post about a week ago with similar issues

    Previous history of this?  Any recent maintenance done?

    I wouldn't automatically call it bad if it just flickered.   It could be a loose cannon plug on the low press switch and the gear going up shook the wall.  It could just be a loose push to test on the warning light.

    What has been done to resolve?

    No and No previous history of hydraulic defect or maintenance  regrading hydraulic system. Low PRESS WX SW connector was checked found SAT . wiring security and circuit checked found SAT . Defect could not duplicate on ground.

    Best Regards

    Munir Abbasi

    Home Hercule4s Pakistan

    UT Suction boost WX Light

    in C-130 Technical

    Posted

    Hello Herks Hydra Expertise!

    B model aircraft,During Retraction cycle of landing gears  with UT system (in-flight) low pressure WX light of UT suction boost pump was Flickered and extinguished when gears were up and locked.   Manufacture  of Suction pump is able corporation sealed type and  without cooling FAN  and also without modification (C-130E airplanes AF72-1288 and up and C-13OH airplanes have a suction boost by-pass circuit. The by-pass line contains a restrictor and a check valve that will continuously circulate one GPM of fluid, from the suction boost pump back to the booster system reservoir, to provide a cooler operating boost pump).  FE Said operation of LDG were  not conducted along  with FLAP ops simultaneously. any expert opinion

    Munir Abbasi

    Home Hercules Pakistan

     

    Flight Director (FD) Flag on Co-Pilot PFD

    in C-130 Technical

    Posted

    13 hours ago, Taimoor said:

    Hello C130 professionals!

    In an E Model Hercules, Flight Director Flag (FD flag) came in view on Co Pilot side PFD on ground during normal checks. Against the defect, all associated LRUs were replaced/swapped with serviceable ones. Even the PFD was swapped with pilot side, yet the flag did not disappear. Continuity of wiring was also double checked and was found SAT. No visible issue was observed yet the flag did not disappear. Autopilot engages without any defect and is working fine. Any ideas as to what might cause this or any previous experience, please do share.

    Thanks!

    Use the built-in
    diagnostics to troubleshoot the autopilot/flight directory
    system. Record all 6 digits in sequence of both left and
    right columns of the diagnostics data. Press and hold any
    3 active MSP buttons for 2 seconds. The PFD shall
    display the REPORT MODE. Use the APP Pitch Wheel
    to select the codes.

    Munir Abbasi

    Flight Director (FD) Flag on Co-Pilot PFD

    in C-130 Technical

    Posted

    12 hours ago, Taimoor said:

    Hello C130 professionals!

    In an E Model Hercules, Flight Director Flag (FD flag) came in view on Co Pilot side PFD on ground during normal checks. Against the defect, all associated LRUs were replaced/swapped with serviceable ones. Even the PFD was swapped with pilot side, yet the flag did not disappear. Continuity of wiring was also double checked and was found SAT. No visible issue was observed yet the flag did not disappear. Autopilot engages without any defect and is working fine. Any ideas as to what might cause this or any previous experience, please do share.

    Thanks!

    Defect is  with  SUIT modification  aircrafts or IAUP aircrafts!

    Munir Abbasi  

    Home Hercules Pakistan

    C-130 Squib/Cartage Life

    in C-130 Technical

    Posted

    Hello Fire extinguisher Squib  Herks expertise.

    Life cycle of C-130B/E model aircraft Squib is not mentioned neither TOs 1C-130H-2-26JG-20-1 nor IC-130B-2-10 and IC-130B-2-7.  but life of squib is mentioned in Service news in  Vol 18,no1  which is not applicable in our fleet. any T.O which provides guide line for life of squib ,installed on Hercules aircraft. any expert opinion

    Munir Abbasi

    Home of Hercules Pakistan

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