Raw TM data is in BSQ generic binary format.

The ltm_ii3a data contains 13 x 7 bands = 91 generic binary images. 

Each image has 5728 rows, and either 6920 or 6930 cols (depending on the
date of the image). To determine whether to use 6920 or 6930 as the number
for the rows (as you would also determine wheter a header was encapsulated, and how big that was), just multiply 5728 x 6920 = 39637760
After downloading the file, do an ls -al to view the size of the file. 
If the file is larger than 39637760 you know the added bytes are due to the
error in the row value (which was documented in the additional information)
since each pixel only contains one byte.

I imported the generic binary format into ERDAS Imagine.
Import->GenericBinary
(select file)

When the selection dialog box appears:
-Select BSQ, 8 bit (one byte), 6920 (or 6930 depending on file) under size of 
 record, 5728 under number of rows, and 6920 (or 6930 depending on file) under
 number of columns).

-Click o.k.

The data can then be viewed in the ERDAS Imagine viewer:
View->Raster->(select file)

To export to jpeg format I used xv software and did a GRAB->SAVE and selected
jpeg.