2k Boeing 737s Must Get Tail Inspections After Jets Pitched Up&Down Mid-Flight

The FAA has ordered inspections of 1,987 US-registered Boeing 737 Next Generation aircraft after operators reported episodes of nose-up-and-down pitching in flight. The directive, effective November 23, covers the 737-600, -700, -700C, -800, -900 and -900ER; it does not apply to the 737 MAX. Technicians must measure excessive movement, or “freeplay,” in the horizontal stabilizer’s two pivot hinges and the jackscrew that positions it. Wear in these components can allow the stabilizer to move more than intended, potentially triggering flutter and, in the worst case, loss of control. Depending on inspection results, airlines may need to repeat checks at required intervals or repair or replace worn parts. The FAA has not disclosed how many pitch-oscillation reports prompted the directive, or which operators experienced them.

Airlines sought more flexibility, but the FAA rejected requests to extend repeat-check intervals, credit prior inspections, replace interim checks with immediate repairs, or delay initial inspections to coincide with heavy maintenance. The agency said the specified schedule is needed to prevent excessive movement from developing in both original and replacement components. Each inspection is expected to take six labor hours and cost about $510, putting the inspection bill for the US fleet above $1 million, before any replacement parts. The order currently applies only to US aircraft; other countries will decide whether to require checks in their fleets. More than 5,160 737NGs are active worldwide, including large fleets operated by Southwest, Ryanair, United and American.