https://news.lockheedmartin.com/2017-11 ... n-Aircraft
https://www.defensenews.com/home/2015/0 ... -new-wing/
However, in particular the structural works turned out to take far longer, became more expensive, and still don't guarantee reliable service until the planned retirement in 2035. So, according to reports today, the German government decided to halt those projects and look for a factory-new replacement aircraft. https://www.tagesschau.de/inland/bundes ... g-101.html [German]
In a letter to the members of the [Parliamentary] Committee on Budgets, which is available from NDR Info, it says: "The prevailing material availability, which has been significantly reduced over the years, results in permanent operational restrictions with an uncertain outcome of the project."
By 2023, the Navy's eight planes were to be modernized. In 2004 the Bundeswehr took over the used aircraft from the Dutch army. For the repair and upgrade, initially 500 million euros were estimated, later another 340 million euros. Airbus took over the work on the Lockheed aircraft and renewed wings and retrofitted electronics. However, work on all of the aircraft has not yet been completed.
The P-3C Orion should be in use until 2035, from then on a new sea reconnaissance aircraft should be introduced. But now it is clear: the modernization was associated with "technical risks", it took longer and the costs continued to rise, as the letter says.
The Federal Audit Office had already examined the modernization of the maritime surveillance and formulated harsh criticism. The auditors complained that the ministry had not defined any criteria for the termination [when defining and awarding the contracts, i. e. the contracts didn't have fixed termination clauses]. Other armaments projects ... were delayed and became increasingly expensive. The auditors also criticized this salami tactic when repairing the Gorch Fock. How the contracting parties now agree and how much the ministry now has to write off is open.
NATO had urged members of the alliance to invest in this capability given the large number of Russian submarines in the North Atlantic. In the letter from the Ministry to the members of the Defense Committee, the Bundeswehr was said to be conducting a "market review", i. e. which aircraft have already been developed and could be bought. The ministry's letter mentions two Airbus and Boeing models, among others.
I'm not sure what Airbus has to offer off-the-shelf, unless they're trying to sell a C295 MPA. Boeing will certainly offer P-8A and make use of their near-monopoly in this market segment. I would personally hope that the Navy is also looking at business jet based offers, since these should suffice for the usual operations near the coast (North Sea, Mediterranean, Horn of Africa).