Like all of my stories YOU LISTEN or READ this one was also a  attempt for involving me in such work that if i don’t concern and the maintenance manual before starting the job would have cause a severe damage  so i advise my students of aviation  the maintenance manual of that   aircraft is the authority  for that particular concern job and never start working on aircraft  till you dont have the complete information and understanding  it’s also very much important to get the information share with your close friends who have work on such as problem or taking the tip from your senior always help but as i said As I said that if you ask somebody right going for that particular job will help but The maintenance   manual           words are always authority   mean no harm to consult with any of your friend  or any senior but maintenance manual is the right steps to follow      so this story start when the supervisor  of airframe famous for involving the junior in some work where the concern person  will keep on asking the guidelines to satisfied his (supervisor EGGO and he ASSIGNS ME TO REMOVE AND INSTALL THE OUTFLOW VALVE OF BOEING 737   pressure relief valve which is  installed at  rear back on fuselage aft cargo door                  the cargo off 737 and I had to replace it so like an obedient servant  I Took the part which was available and complete job documentation for sign off the job completion paperwork was in my hand  given to me by supervisor to save the time for go to start  the job  but there was no maintenance manual paper printout ( in saudia airline in my days whenever we start work we were suppose to have the printout of that particular job  in our hand a must)            he gave me the PART AS WELL AND TOLD ME TO GO ON THE AIRCRAFT AND AS USUAL THE WORD I HAVE GIVEN THE MAT( maintenance advisory time given by maintenance manager for completion of job so planning make arrangements for flight or schedule for flight) ((mat is also used to keep the mechanic under pressure to complete the job in specific time ))  while I was walking and  going towards aircraft i I saw one of my friend and he was then  an aircraft inspector in aircraft maintenance   Inspection Department   he asked me where are you working  and where was i going   i told him i am going on the aircraft parked outside  as hangar the aircraft was  parked outside the hangar I told him I’m going to remove the 737 OUTFLOW VALVE and that was the first time to do such job  he asked me the same question  did you  ever did this  job before      l had to start the job  I don’t know what I’m going to do it first time so he I said  oh no    he again  told me so why don’t you just go to the maintenance manual  as i remember    there is a warning before you start the job go  read it  there was no maintenance paper was in my hand as the print machine was out of order and  there was no paper in there any way           just went to the micro machines the 3m ones at that time   again I had the sign off documents only  and as  the print machine was not having any paper so I read the warning line that was indicating that NEVER DISCONNECT THE CANNON PLUG PROVIDING POWER TO THAT VALV EVEN THE AIRCRAFT HAS NO POWER HOOKED TO AIRCRAFT 

 And step 2.  never attempt from the outside of the aircraft AS IT IS VISIBLE  but reach to that valve from the aft cargo panel to be removed after open up of cargo door inside aft cargo rear panels and then disconnect  i was not aware of that particular dangerous step at that time   so i read the line and got the warning message  i brought the small ladder and open aft cargo door went inside and remove the aft cargo access panels panels   now  then i disconnect the electrical cannon plug sooner i remove the cannon plug the spring loaded valve suddenly shuts and close  just imagine if i had the cannon plug open while standing outside of aircraft as it was visible  and a   shortcut would have cause the crushing of my hand  so again i thank ALMIGHTY  and came outside cargo and then remove the fastener screws of that valve and easily remove it  i took the valve towards my SUPERVISOR and his companion and just didn’t say any word but still now i have the memory of their strange looking face as they were expecting that news will break of mechanic got his hand brushed or crushed in  the valve as it  is spring loaded and remain alive even there is no power   again  it was all ALMIGHTY help and my mother blessing may be some of my good deed i was safe once again whenever now i revive the story in my mind i thanks mr TAMSAL NAQVI  who was the supervisor of aircraft  maintenance inspection department whom i met before going to start the job his advice of concerning the MAINTENANCE manual  had saved me from an horrible would be surprize   i wish wherever he is  may ALMIGHTY keeps him in good health and prosperity so my friends it’s good practice to discuss with some senior personnel for related job talk if you are going to do it for first time and again do not forget to do the job as per maintenance manual always 

Explanation 737 OUTFLOW VALVE  is the device that relieves pressurization on the ground after an aircraft landing