Mechanical Bulletins

Mechanical Bulletins contain information pertaining to umpire issues, mechanics and rotations. Following a review of reports from umpires returning from International competitions and our own inconsistencies across the country in relation to mechanics, the following memos and various National Umpiring Program Mechanic Bulletins will dictate how mechanics are to be used across the country.

Date released

Bulletin id

Title

Size

2017 October

MB-2017-1

Three/Four Umpire System – Umpire Mechanic Changes

(112kB)

2011 December

MB-2011-1

Three Umpire System – Outfield Mechanics

(112kB)

2009 November

MB-2009-10

Infield Fly Mechanic

(126kB)

2009 October

MB-2009-8

Inside / Outside Theory

(201kB)

2009 October

MB-2009-6

Third Strike and Trapped Balls

(185kB)

2009 October

MB-2009-5

Outfield Corrections

(142kB)

2009 October

MB-2009-4

Check Swing

(184kB)

2009 October

MB-2009-3

Plate Work

(215kB)

2009 October

MB-2009-2

Count Signal

(150kB)

2009 October

MB-2009-1

Vocals

(188kB)