All covered in JSP 831 (you can google it for the PDF download)
2.3 Time Limits for Stating a Service Complaint. Service complaints must
normally be made within 3 months, beginning with the day the matter complained
of occurred. If the matter complained about occurred over a period, the complaint
should be submitted within 3 months of the latest incident or end of the period.
There is no limit as to how far back a period can extend. An allegation submitted to
the SCC, which subsequently results in a Service complaint being made by a
Service person, is within the time limit if the Service complaint is received by the CO
within 3 months of the date of the matter about which the complaint is being made. A
CO may decide to investigate any matter brought to his attention irrespective of
whether it results in a Service complaint being made.
COMPLAINTS ABOUT APPRAISAL REPORTS
2.30 Process. JSP 75745 contains the general instructions on appraisal reports.
The subject of a report has the opportunity to comment on the first reporting officers
assessment, but comments do not carry any formal requirement for the second or
third reporting officers to give a direct reply. However, the second reporting officer
will take any comments into consideration when making their assessment and career
managers and selection board members will also see comments. These procedures
do not affect the Service persons right to make a Service complaint at any time
within the time limits
Kenny is right ( as is DC). For a Service complaint WRT an SJAR it is 3 months from the date you became aware ie;
If it is about the 1RO part, and you hit the complete button on JPA on 31 May 10, you have until 31 Aug 2RO 3 months from when the report was released to you. You can still submit a compaint outside the time limits if you have a good enough reason (ie; on ops, no JPA access and part 2 of report seen 4 months after released by APC)
If the complaint is about the 2RO part of your SJAR and this was written by the CO, he cannot deal with the complaint, it will go to the next HA in the discipline chain, although the complaint is still made to your CO.