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Subject: M777
Smoke WP    4/9/2006 4:49:20 PM
Can anyone here provide a brief description on how to handle a mis-fire?
 
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Carl S    RE:M777   4/9/2006 9:21:27 PM
If you mean the cannon failed to fire at all: From memory, trigger it at least twice more, if no result wait a specified number of minutes and change the primer cartridge. If that fails, wait another specified time, then open the breech. If it is really important I can go look up my safety reg. from the previous decade. Which may or may not be obsolete. Back in the olden days on Okinawa we had two M110 remaining the 12th Marines. The firing locks were so worn that they had to be triggered just so. Tug the laynard a hair wrong & the thing wouldnt fire. One bad day I saw one of them triggered about twenty time before it hit the primer.
 
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Smoke WP    RE:M777   4/10/2006 11:06:59 AM
Reason for the question, I am a retired Canadian gunner, I was wondering how safe a mis-fire on the M777 is compared to the M109.
 
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Carl S    RE:M777   4/10/2006 1:49:32 PM
Best not be asking other retired guys then. ; )
 
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ArtyEngineer    RE:M777 - Smoke   4/10/2006 9:50:25 PM
I will answer any and all your queries regarding the M777 when I get a spare minute. I should be able to post teh misfire procedure from the operators manual as I have worked out how to get from PDF format to jpg format and hence onto the web via photobucket picture hosting site. However am really really busy at the mo, so be patient ;)
 
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Smoke WP    RE:M777   4/13/2006 1:33:16 PM
Is there a web site or printed material available that could answer my many questions about the Triple7
 
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ArtyEngineer    RE:M777 - Smoke   4/14/2006 6:46:42 PM
Most web stuff is either innacurate or totally out of date, however I have been involved with the design development and test of the weapon system for the last 5 years, and am currently responsible for integration and final acceptance testing before hand off to the US Marines, so I feel that I am reasonably well qualified to answer any questions you may have. If I aint, then I dont know who is ;). Will post the misfire procedure it a bit.
 
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ArtyEngineer    RE:M777 Misfire Procedures   4/14/2006 7:34:32 PM
From Operators manual, mis fire procedures for various tube conditions.








 
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Smoke WP    RE:M777 Misfire Procedures   4/15/2006 1:30:54 PM
Thank you very much for the information. TWD, is that a measuring device for checking tube temperature and if so is it mounted on the gun. TWD is short for? Please forgive my many questions, as a retired gunner I am still interested in keeping up on new weapons.
 
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ArtyEngineer    RE:M777 Misfire Procedures   4/15/2006 1:42:43 PM
Yep, TWD stands for Thermal Warning Device, and is permenantly mounted to the tube.
 
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Smoke WP    RE:M777 Misfire Procedures   4/16/2006 7:51:24 AM
I am thinking that since none of the guns I have worked with had TWD, the M777 barrel is proned to heat up faster than we are accustomed to.
 
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ArtyEngineer    RE:Smoke    4/16/2006 10:48:04 PM
Well smoke, I am not entirely sure, the tube in the M777 is designated M776, it is an M284 tube externally (an M109 Palidin tube) with the internal features of an M199 tube (the tube from an M198 towed howitzer), very recently I carried out a thermal warning device trial when we shot an M777 and a M198 side by side and monitored the performance of the TWD, they behaved exactly the same, so i would hqve to say that the M777 is no more susceptible to tube heating than any other howitzer. What howitzers were you involved with in you time with the canadian Military?
 
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Smoke WP    RE:Smoke    4/17/2006 10:35:29 AM
I knew that the barrels of the M777 and the M109 were similar from the BAE website. I just mentioned the fact that none of the guns that I worked on (155mm towed and M109) ever had a TWD. I also have worked on 105mm C1, L5 Pack Howitzer, 4.2 mortar but mostly M109.
 
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ArtyEngineer    RE:Smoke    4/17/2006 11:18:53 AM
You sure the M109 doesnt have a TWD? Also, what was the towed 155mm you have worked on?
 
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Smoke WP    RE:Smoke    4/17/2006 5:35:05 PM
The last time I was on a 155 towed was back in 1968. I'm not sure but I believe it was the same as the US were using. We switched over to the M109 in 1968.
 
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Smoke WP    RE:Smoke    4/17/2006 5:36:41 PM
Forgot to mention, I am positive that none of the guns ever had a TWD.
 
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