Page 1 of 18
MACS 609 CERTIFICATION 2026 EXAM
COMPLETE CURRENT QUESTIONS AND
CORRECT DETAILED ANSWERS|TOP-RATED
A+.
MACS
Prepare for your MACS 609 Certification Exam with this complete
study guide. It covers core concepts, technical skills, and
industry best practices relevant to the certification. Perfect for
reinforcing knowledge and boosting exam readiness. Suitable for
MACS certification candidates and aviation maintenance
professionals.
If lubricant is removed by recovery equipment during system
refrigerant removal, what must be done with the lubricant?
✓ ✓ ...... ANSWER ....... Re-install lubricant removed by
the recovery equipment
Before reuse, what must be done with HFC-134a that has
been recovered from a mobile A/C system using recovery-
only equipment? ✓ ✓ ...... ANSWER ....... Question 2
options:
, Page 2 of 18
Recycle the HFC-134a before reuse using certified
equipment
When can HFC-134a become combustible in a mobile air
conditioning system? ✓ ✓ ...... ANSWER ....... If shop air
is used in the system in an attempt to check for leaks and
HFC-134a is present
Which type of mobile A/C system will usually require
additional time / precautions to extract all the refrigerant? ✓
✓ ...... ANSWER ....... Accumulator type
Electronic leak detectors certified to SAE J2791 have the
capacity of identifying leakage rates as low as: ✓ ✓ ......
ANSWER ....... 0.15 ounces per year
When recovery/recycling equipment is used to remove
refrigerant from a mobile A/C system, how much lubricant
will be removed during the operation? ✓ ✓ ...... ANSWER
....... Generally, very little, if any
, Page 3 of 18
Why is it necessary to insure that service port caps
containing good seals are installed? ✓ ✓ ...... ANSWER
....... To minimize refrigerant loss
Which of the following statements is correct about flushing
A/C systems? ✓ ✓ ...... ANSWER ....... Flushing solvents
may remain in A/C systems, causing problems
When using an HFC-134a refrigerant recovery machine, after
competing the first recovery process, how long must you
wait, then check the machine's gauges for a rise in pressure
above vacuum, which would indicate that the system still
contains some refrigerant? ✓ ✓ ...... ANSWER ....... 5
minutes
Which type of tank must be used during the transfer of
refrigerant? ✓ ✓ ...... ANSWER ....... Question 10 options:
Tanks marked DOT 4BA
When it has been determined that an A/C system has a low
refrigerant charge, what should be done? ✓ ✓ ......
ANSWER ....... Perform a leak detection procedure
MACS 609 CERTIFICATION 2026 EXAM
COMPLETE CURRENT QUESTIONS AND
CORRECT DETAILED ANSWERS|TOP-RATED
A+.
MACS
Prepare for your MACS 609 Certification Exam with this complete
study guide. It covers core concepts, technical skills, and
industry best practices relevant to the certification. Perfect for
reinforcing knowledge and boosting exam readiness. Suitable for
MACS certification candidates and aviation maintenance
professionals.
If lubricant is removed by recovery equipment during system
refrigerant removal, what must be done with the lubricant?
✓ ✓ ...... ANSWER ....... Re-install lubricant removed by
the recovery equipment
Before reuse, what must be done with HFC-134a that has
been recovered from a mobile A/C system using recovery-
only equipment? ✓ ✓ ...... ANSWER ....... Question 2
options:
, Page 2 of 18
Recycle the HFC-134a before reuse using certified
equipment
When can HFC-134a become combustible in a mobile air
conditioning system? ✓ ✓ ...... ANSWER ....... If shop air
is used in the system in an attempt to check for leaks and
HFC-134a is present
Which type of mobile A/C system will usually require
additional time / precautions to extract all the refrigerant? ✓
✓ ...... ANSWER ....... Accumulator type
Electronic leak detectors certified to SAE J2791 have the
capacity of identifying leakage rates as low as: ✓ ✓ ......
ANSWER ....... 0.15 ounces per year
When recovery/recycling equipment is used to remove
refrigerant from a mobile A/C system, how much lubricant
will be removed during the operation? ✓ ✓ ...... ANSWER
....... Generally, very little, if any
, Page 3 of 18
Why is it necessary to insure that service port caps
containing good seals are installed? ✓ ✓ ...... ANSWER
....... To minimize refrigerant loss
Which of the following statements is correct about flushing
A/C systems? ✓ ✓ ...... ANSWER ....... Flushing solvents
may remain in A/C systems, causing problems
When using an HFC-134a refrigerant recovery machine, after
competing the first recovery process, how long must you
wait, then check the machine's gauges for a rise in pressure
above vacuum, which would indicate that the system still
contains some refrigerant? ✓ ✓ ...... ANSWER ....... 5
minutes
Which type of tank must be used during the transfer of
refrigerant? ✓ ✓ ...... ANSWER ....... Question 10 options:
Tanks marked DOT 4BA
When it has been determined that an A/C system has a low
refrigerant charge, what should be done? ✓ ✓ ......
ANSWER ....... Perform a leak detection procedure
