Marks & Sniff Checks???
forty years ago, I used to pick up copies of expired paper work to
take home for my kids to play with. I still have a few pages
left, and looking at them recently I saw a couple that aroused my
curiosity, and I am wondering if any of you ex-maintenance guys
out there can answer my questions.
The first one has to do with a Maintenance Service Letter 336R1,
dated May 3, 1956, and the subject is FUSELAGE CHOP MARKS -- ALL
AIRCRAFT. The message is as follows:
further study as to the advantage of chop marks, such marks now
installed on aircraft are to be retained. Aircraft on which
such have been deleted will be corrected at a later date if
stations are to continue the maintenance of chop marks now in
I recall what chop marks were supposed to be used for, but
how many remember just where they were located on our airplanes? If
I remember correctly, at that time we were operating
Constellations from the 049‘s through the 749, 749A and 1049G
and M202A and M404 and a few DC-4‘s.
My next question has to do with a Maintenance Supplementary Work
Sheet dated 12-1-61, and stated the following:
the following work at the arrival of each 707-131, including
MAKE EXTENSIVE SNIFF CHECK AT THE FOLLOWING LOCATIONS; (1) COWL
INLET, (2) OIL COOLER EJECTOR OPENING, (3) SOUND SUPPRESSOR, (4)
FORWARD FIRE ACCESS WITH DOOR OPEN AND VISUALLY INSPECT FOR STAIN
AT TURBO-COMPRESSOR EXHAUST.” (There
were a few more directions)
My question here is this: what in the world were you sniffing
for and how did it smell?
If anyone out there has any answers to my questions, please
contact me at email@example.com.
and enlighten me.
Horton, 1941-1983, served in Maintenance/Technical Services
Engineering and Field Maintenance.
Editor’s Note: Keith, if you
get any replies, please share ‘em with the rest of us on