Bhutan national airline’s ATR 42-500 aircraft grounded of technical problems

Despite conducting a three-day rimdro or prayer ceremony for its aircraft last week, the national airline’s ATR aircraft is once again grounded as a result of technical problems.

The 48-seater twin turbo propellor ATR 42-500 aircraft has been grounded since Wednesday and is expected to remain grounded until Sunday. The airline’s officiating CEO, Rinzin Dorji said that the date for the aircraft’s reintroduction into scheduled services is “tentative”.

Drukair general manager, engineering section, Thrimchong Wangdi, explained that the de-icing boot on one of the aircraft’s wing was “ruptured” and non-functioning. The de-icing boot is a rubber device located on the front surface edge of the ATR’s wings to allow for mechanical de-icing. The front surface edge of an aircraft’s wing is one area most likely to accumulate ice during flight. Ice on an aircraft’s wing can cause disruptions in airflow, leading to loss of lift or control.

According to a source, the non-functioning de-icing boot was discovered mid-air while the aircraft was flying from Kathmandu to Paro.

Drukair management and engineering downplayed the risks of such an incident.

Thrimchong Wangdi pointed out that the ATR is equipped with “2-3” redundancy measures or back up systems, in case a de-icing boot fails. “From that perspective, it’s not a very serious concern.”

This is at least the fourth grounding of the ATR aircraft since it joined the Drukair fleet in June. The induction itself was delayed by about two weeks. Two groundings were required to prevent the aircraft’s only two pilots from exceeding the accepted number of flight hours in July. A damaged wheel bearing, which required the entire landing gear assembly to be shipped to and repaired in Singapore, grounded it early this month for about two weeks.

On why Drukair has hired only two pilots, Rinzin Dorji attributed costs.

“It’s very, very expensive,” he said, on hiring pilots from abroad. Two international pilots, and two engineers have been hired with the aircraft.

The captain’s salary is about USD 10,000/month, according to Rinzin Dorji, while the engineers are paid about USD 7000/month. He pointed out that Bhutanese pilots are in the “pipeline”.

The technical problems have caused some observers to raise safety concerns with regard to the aircraft’s age. The department of civil aviation only last week said it had no concerns regarding the safety of the ATR. Drukair officiating CEO also emphasised that the ATR is in “good condition” and that thorough examinations of the aircraft had carried out before leasing it.

The ATR, which has been leased for one year, with a purchase option at the end of the term, is nine years old. It was previously operated by the French Polynesian government as a VIP aircraft, and by a domestic airline, Air Tahiti.

During its service there, the aircraft did not experience any major technical issues, according to sources. The French Polynesian government sold the aircraft for financial purposes, not because of technical problems, according to the chief of staff at the French Polynesia vice-presidency, Moetai Brotherson. “It has gone through a thorough technical expertise,” he said in an email interview. A member of the Polynesian press confirmed this.

The French Polynesian government sold the ATR to an aircraft maintenance company, Mk Tek Europe for USD 8.6 M. Drukair then leased/purchased the ATR from this company for about USD 9.8M, according to Rinzin Dorji. He pointed out that this amount was an estimation as he did not have the figures immediately.

Meanwhile, spare parts for the ATR had to be ordered from Copenhagen, Denmark, and are due to arrive today.

Source: Kuenselonline