All Nippon Airways (ANA) has revealed it will have to reduce its schedule early next year due to the latest inspection requirements for Pratt & Whitney PW1100G-JM engines, which will also result in revenue cuts.

The airline says 33 of its Airbus narrowbodies will be affected by the inspections, comprising 11 A320neos and 22 A321neos. This represents the carrier’s entire neo fleet, according to the Aviation Week Network Fleet Discovery database.

The inspections are spurred by an issue identified by Pratt earlier this year related to powder metal parts manufactured during a certain period. Several airlines are affected by this.

Engine inspections will begin in January 2024. The process will take place in phases, and 25 aircraft will be taken out of service in the January-February period, an ANA spokeswoman tells Aviation Daily.

ANA says it will have to cut some flights on certain international and domestic routes to account for aircraft being out of action during the inspections. This will affect about 30 flights per day between Jan. 10 and March 30, 2024, representing 3.6% of ANA’s scheduled flights. The effect on operations beginning March 31, 2024, is due to be announced in January.

Reductions will mainly be made on routes where alternate flights are available on the same day, ANA says. Independent Japanese carriers Star Flyer and Solaseed Air will operate 134 additional flights on some domestic routes during the affected period, which will be codeshared with ANA.

ANA estimates that its fiscal 2023 revenue will be reduced by ¥8 billion ($53.5 million) as a result of the engine inspections and schedule cuts. ANA’s fiscal 2023 extends through March 31, 2024.

Parent company ANA Holdings announced a ¥93.2 billion net profit for the six months through Sept. 30, its fiscal first half. Its operating profit and margin were both records for this period, the carrier said.

ANA Holdings is so far not changing its forecast of an ¥80 billion net profit for the full fiscal year. A robust recovery in passenger demand and cost management efforts are expected to offset the revenue loss from the schedule reductions and higher oil prices. ANA also said it will strive to increase the profit estimate.