While en route to a G20 summit in Buenos Aires in November 2018, the A340-300 "Konrad Adenauer" carrying German Chancellor Angela Merkel and Finance Minister Olaf Scholz had to make an unexpected landing at the Cologne/Bonn Airport. Merkel showed up late to the conference in the Argentinian capital.

It was the second consecutive month in which the "Konrad Adenauer" needed to be grounded. The A340 also left Scholz stranded in Indonesia following a meeting of the International Monetary Fund in October 2018 after rodents gnawed through electric cables.

The "Konrad Adenauer" isn't the only Airbus belonging to the German government that has experienced problems. The A340 "Theodor Heuss" jet carrying German President Frank-Walter Steinmeier experienced technical problems during his trip to several countries in Africa.

Steinmeier also had his fair share of woes with the "Konrad Adenauer" jet. The German president's trip to Belarus in June 2018 was delayed due to problems with the plane's hydraulic system.

German Development Minister Gerd Müller's schedule was thrown into chaos when he was forced to cancel a visit to Namibia in January 2018 — because of plane trouble. Müller was scheduled to depart Malawi when his Bombardier Global 5000 was unable to take off due to a defective pressure valve. He was eventually able to continue on to Zambia on a commercial flight.

German President Frank-Walter Steinmeier was grounded in Ethiopia yet again when the "Theodore Heuss" was unable to embark on its return flight due to an air pressure problem. The delay would seem to put Steinmeier ahead of Olaf Scholz for the title of German official most often stranded due to technical problems.

On February 28, 2019, Foreign Minister Heiko Maas was forced to stay overnight in the capital of Mali, Bamako, after his government plane had a mechanical problem. Maas strugged off the delay, saying he had traveled all over the world without a problem.

On April 1, 2019, the "Konrad Adenauer" hit back after a four-month overhaul. The ageing Airbus behaved badly on its first outing after its forced hiatus. Foreign Minister Heiko Maas was on board when one of the tire's burst upon landing in New York. The plane had to be towed to a parking space, with the delay forcing Maas to miss an appointment at the UN Security Council.

Also in April 2019, a Bombardier Global 5000 was severely damaged in an emergency landing after problems during a test flight. Pilots lost control of the plane shortly after take off and when attempting to land, where it jolted off the runway. The flight was a test flight after weeks of maintenance on the aircraft.

In May, Foreign Minister Heiko Maas was delayed for a third time after engine trouble struck the Bundeswehr A321 he was travelling on for his first trip to Bulgaria. The plane's pilot blamed the failure of an auxiliary turbine, which supplies compressed air to the plane's engines, for the tardiness.

Frustrated soldiers and a defense system struggling to repair its way into a fully functioning military. And a new defense minister who will have to regain confidence from army representatives.

Ageing helicopters have proved a big hurdle for the German military. The Bundeswehr has grounded all its 53 Tiger helicopters, after engineers said technical faults needed attention. Defense services were also forced to recall 22 Sea Lynx anti-submarine helicopters in 2014, confirming newspaper reports of malfunction.

The Eurofighter is the German military's most modern fighter jet. As a result of a manufacturing error, only four of the 128 planes were in action in 2018. A pilot was killed in June 2019 when two Eurofighters collided in the northeastern state of Mecklenburg-Western Pomerania, prompting fresh calls for further restrictions on the plane's use.

Tornado fighters have been flying for over 40 years. CDU plans to replace the ageing planes were thrown into question by the center-left SPD in February 2019. But some officials claim flying the Tornado after 2030 could cost Germany around €8 billion ($9 billion) in repair costs.

New Puma tanks for the German military came into use in 2018. Only 27 of the 71 Pumas were immediately ready for deployment — which prompted a fresh backlash against then Defense Secretary Ursula von der Leyen.

New F125 frigates — but they are't ready yet. German plans to replace the old frigates stalled in 2018, due to there not being enough spare parts to make them seaworthy. Officials also said Germany would have to soon stop signing up to NATO and UN missions in the same year — the country just did not have enough ships spare.

She has not been in the job long, but Annegret Kramp-Karrenbauer has inherited a huge problem. Old equipment being grounded is now a regular and pressing occurrence. Former Defense Minister Ursula von der Leyen signed a deal to develop a "Future Combat Air System" in June — which is scheduled to replace Germany's air force by 2040.