The Virtual AGC page has Revision A and B of the LM systems handbook listed in 'Recent additions'.

• Revision A is for LM1 (AS-206), Oct 27, 1966. This seems to be a complete document, 273 pages.
• Revision B is also for LM1, March 16, 1967. 282 pages.

For completeness' sake I'll list what else I found.

• the Apollo Lunar Surface Journal has PCN 4 only.
• Herorelics doesn't have it.
• NASA Technical Report Server used to have at least one, number 19730069927. That seems to have been deleted/made unavailable for public viewing.
• I found nothing at archive.org, either.

A few libraries have physical copies. A copy comes up for auction occasionally and fetches several thousand dollars.

The Virtual AGC page has Revision A and B of the LM systems handbook listed in 'Recent additions'.

• Revision A is for LM1 (AS-206), Oct 27, 1966. This seems to be a complete document, 273 pages.
• Revision B is also for LM1, March 16, 1967. 282 pages.

For completeness' sake I'll list what else I found.

• the Apollo Lunar Surface Journal has PCN 4 only.
• Herorelics doesn't have it.
• NASA Technical Report Server used to have at least one, number 19730069927. That seems to have been deleted/made unavailable for public viewing.
• I found nothing at archive.org, either.

A few libraries have physical copies. A copy comes up for auction occasionally and fetches several thousand dollars.

The Apollo Lunar Surface Journal has a nice reference section that includes FC027.

Other sites with Apollo reference material (that don't seem to have a copy of FC027):

• Herorelics
• NASA Technical Report Server

The Virtual AGC page has Revision A and B of the LM systems handbook listed in 'Recent additions'.

• Revision A is for LM1 (AS-206), Oct 27, 1966. This seems to be a complete document, 273 pages.
• Revision B is also for LM1, March 16, 1967. 282 pages.

For completeness' sake I'll list what else I found.

• the Apollo Lunar Surface Journal has PCN 4 only.
• Herorelics doesn't have it.
• NASA Technical Report Server used to have at least one, number 19730069927. That seems to have been deleted/made unavailable for public viewing.
• I found nothing at archive.org, either.

A few libraries have physical copies. A copy comes up for auction occasionally and fetches several thousand dollars.