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Wrong cannon tube life?

Crewmen, you want the M199 cannon tube on your M198 towed howitzer to last as long as possible. But in some cases, that's not happening.

The problem comes when DS performs a pullover gauge reading. They usually post "Borescope Serviceable IAW TM 9-1000-202-14" in the Remarks column of the DA Form 2408-4 along with the actual pullover reading. Unfortunately, they often neglect to update the Remaining Life (EFC RDS) column.

To do that, they're supposed to use Table K-2 in TM 9-1000-202-14, Evaluation of Cannon Tubes. Based on the wear reading, the table provides a new EFC count--usually a pretty big gain. That means the cannon tube's life is extended.

But if the corrected EFC count isn't added to the Remaining Life (EFC RDS) column, you'll probably just continue to use the old EFC count. That means the cannon tube's life goes down faster than it should.

Things get even more complicated when it's time to enter the data from the hard copy 2408-4 into the online electronic version of the form. When the actual wear reading from the Remarks column is entered, the system automatically enters the corrected EFC count in the Remaining Life (EFC RDS) column.

Now what you have listed in your hard copy 2408-4 and what shows up on the automated form don't match. Let the hair pulling commence!
BORE MEASUREMENT EST. REMAINING LIFE *
41.75 INCHES

WEAR ACTUAL DIA. PERCENTAGE EFC ROUNDS

(Gauge Reading)

 0 6.100 100 1750
.005 6.105 95 1663
.010 6.110 90 1575
.015 6.115 85 1488
.020 6.120 80 1400
.025 6.125 75 1313
.030 6.130 70 1225
.035 6.135 65 1138
.040 6.140 60 1050
.045 6.145 55 963
.050 6.150 50 875
.055 6.155 45 788
.060 6.160 40 700
.065 6.165 35 613
.070 6.170 30 525
.075 6.175 25 438
.080 6.180 20 350
.085 6.185 15 263
.090 6.190 10 175
.095 6.195 5 88
.100 ** 6.200 0 0

* Use lowest estimated remaining life obtained with wear
at the 41.75 in location. Enter the "EFC Rounds" value on
the cannon tube's 2408-4 card in the "Remaining Life
(EFC RDS)" column.

** Condemnation Limit: Condemnation will be based on
tube wear regardless of rounds fired.
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Title Annotation:M198 Towed Howitzer ...
Publication:PS, the Preventive Maintenance Monthly
Geographic Code:1USA
Date:Feb 1, 2005
Words:389
Previous Article:Quick checks generate results.
Next Article:Howitzer 'how to' PM.
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