European safety regulators have restored the third-country authorisation to Turkmenistan Airlines which had been withdrawn early this year.
The Central Asian flag carrier had been forced to resort to wet-lease operations to maintain European services following the withdrawal.
It subsequently enlisted Lufthansa Consulting, in February, to assist with supporting a return to compliance with European Union Aviation Safety Agency criteria.
Turkmenistan Airlines says it took "immediate action" to address the "difficulties in satisfying relevant requirements" for third-country operators.
It states that EASA carried out an audit at the carrier's base in Ashgabat at the end of September, and reauthorised the airline on 11 October.
Lufthansa Consulting worked with the airline to oversee management system changes and implementation of other matters.
It describes the restoration of approval as a "great success", although Lufthansa Consulting managing director Andreas Jahnke adds: "There are certain tasks to be done by the operator to ensure sustainable implementation of the measures.
"Lufthansa Consulting is looking forward to continuing the fruitful co-operation."
EASA's latest revision to its third-country operator registry, dated 17 October, lists Turkmenistan Airlines as an approved carrier.
Turkmenistan Airlines operates a mixed fleet including Boeing 777-200LRs, 757-200s and 737-700/800s. It also uses various helicopter types as well as Ilyushin Il-76TD freighters.