A six-week audit by the Federal Aviation Administration of Boeing’s manufacturing of the 737 Max jet discovered dozens of issues all through the manufacturing course of on the aircraft maker and one among its key suppliers, in response to a slide presentation reviewed by The New York Instances.

The air-safety regulator initiated the examination after a door panel blew off a 737 Max 9 throughout an Alaska Airways flight in early January. Final week, the company introduced that the audit had found “multiple instances” during which Boeing and the provider, Spirit AeroSystems, didn’t adjust to quality-control necessities, although it didn’t present specifics concerning the findings.

The presentation reviewed by The Instances, although extremely technical, provides a extra detailed image of what the audit turned up. Because the Alaska Airways episode, Boeing has come below intense scrutiny over its quality-control practices, and the findings add to the physique of proof about manufacturing lapses on the firm.

For the portion of the examination centered on Boeing, the F.A.A. carried out 89 product audits, a sort of evaluation that appears at features of the manufacturing course of. The aircraft maker handed 56 of the audits and failed 33 of them, with a complete of 97 situations of alleged noncompliance, in response to the presentation.

The F.A.A. additionally carried out 13 product audits for the a part of the inquiry that centered on Spirit AeroSystems, which makes the fuselage, or physique, of the 737 Max. Six of these audits resulted in passing grades, and 7 resulted in failing ones, the presentation stated.

At one level through the examination, the air-safety company noticed mechanics at Spirit utilizing a resort key card to examine a door seal, in response to a doc that describes among the findings. That motion was “not recognized/documented/called-out within the manufacturing order,” the doc stated.

In one other occasion, the F.A.A. noticed Spirit mechanics apply liquid Daybreak cleaning soap to a door seal “as lubricant within the fit-up course of,” in response to the doc. The door seal was then cleaned with a moist cheesecloth, the doc stated, noting that directions have been “imprecise and unclear on what specs/actions are to be adopted or recorded by the mechanic.”

Requested concerning the appropriateness of utilizing a resort key card or Daybreak cleaning soap in these conditions, a spokesman for Spirit, Joe Buccino, stated the corporate was “reviewing all recognized nonconformities for corrective motion.”

Boeing didn’t instantly touch upon the outcomes of the audit. In late February, the F.A.A. gave the company 90 days to develop a plan for quality-control enhancements. In response, its chief govt, Dave Calhoun, stated that “we now have a transparent image of what must be carried out,” citing partially the audit findings.

Boeing stated this month that it was in talks to acquire Spirit, which it spun out in 2005. Mr. Buccino stated on Monday that Spirit had obtained preliminary audit findings from the F.A.A. and deliberate to work with Boeing to deal with what the regulator had raised. He stated Spirit’s purpose was to scale back to zero the variety of defects and errors in its processes.

“In the meantime, we proceed a number of efforts undertaken to enhance our security and high quality applications,” Mr. Buccino stated. “These enhancements concentrate on human elements and different steps to attenuate nonconformities.”

The F.A.A. stated it couldn’t launch specifics concerning the audit due to its ongoing investigation into Boeing in response to the Alaska Airways episode. Along with that inquiry, the Nationwide Transportation Security Board is investigating what precipitated the door panel to blow off the aircraft, and the Justice Division has begun a criminal investigation.

Throughout the F.A.A.’s examination, the company deployed as many as 20 auditors at Boeing and roughly half a dozen at Spirit, in response to the slide presentation. Boeing assembles the 737 Max at its plant in Renton, Wash., whereas Spirit builds the aircraft’s fuselage at its manufacturing facility in Wichita, Kan.

The audit at Boeing was vast ranging, masking many elements of the 737 Max, together with its wings and an assortment of different methods.

Most of the issues discovered by auditors fell within the class of not following an “permitted manufacturing course of, process or instruction,” in response to the presentation. Another points handled quality-control documentation.

One audit handled the element that blew off the Alaska Airways jet, generally known as a door plug. Boeing failed that examine, in response to the presentation. A few of the points flagged by that audit associated to inspection and quality-control documentation, although the precise findings weren’t detailed within the presentation.

The F.A.A.’s examination additionally explored how nicely Boeing’s staff understood the corporate’s quality-control processes. The company interviewed six firm engineers and scored their responses, and the general common rating got here out to solely 58 %.

One audit at Spirit that centered on the door plug element discovered 5 issues. A kind of issues, the presentation stated, was that Boeing “failed to offer proof of approval of minor design change below a technique acceptable to the F.A.A.” It was not clear from the presentation what the design change was.

One other audit handled the set up of the door plug, and it was amongst those who Spirit failed. The audit raised considerations concerning the Spirit technicians who carried out the work and located that the corporate “failed to find out the data essential for the operation of its processes.”

Different audits that Spirit failed included one which concerned a cargo door and one other that handled the set up of cockpit home windows.

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