I think the technicians literally walk around the turbine to check (visually) that everything's OK.

See:
http://www.google.com/search?hl=en&q="walkaround inspection"

Maybe they mean that they spin the turbine round to check it.

would fit in these contexts

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Note added at 6 hrs (2009-09-05 00:38:24 GMT)
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which is the same as suggested by bcboudens

de ‘run-out’ (van een gereedschap) = de limiet van de rondloopnauwkeurigheid

see e.g.:

‘According to Mattes, a thorough incoming inspection of a GT rotor consists of:

1. Incoming visual inspection for shipping damage.
2. Visual inspection for general condition of rotor and any noticeable findings.
3. Dimensional inspection of journals, seals, coupling fits, blade tip diameters, and overall rotor length.
4. Incoming balance, with and without buckets.
*** 5. Run-out inspection. ***
6. Bucket removal.
7. Blast cleaning.
8. Magnetic-particle inspection of rotor body and ultrasonic inspection of rotor bolts.
9. Repeat bucket rock inspection.
10. Bucket hardware detailed inspection.’

(http://www.ccj-online.com/3q-2006/gt-rotor-overhaul/ )

‘The latest version of the iMAP platforms are integrated to a PC which controls the rotation of the rotary table and contains full **run-out inspection software designed to inspect mechanical run-out** and other circular geometry such as roundness, concentricity and parallelism, providing a dedicated inspection workstation. The system features IntelliProbe technology which is designed to address problems common with **circular geometry inspection** such as profile distortion due to part misalignment.’

(https://www.aero-mag.com/putting-measurement-on-the-map/ )

see also my Ref. comment below

+

https://www.google.com/search?ei=g_-CXIeRKrSz1fAPwJeP8AE&q=“... (Google search for: “gas turbine” “run-out inspection”)

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Note added at 3474 days (2019-03-11 16:38:19 GMT) Post-grading
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see: https://en.wikipedia.org/wiki/Run-out

'Run-out or runout is an inaccuracy of rotating mechanical systems, specifically that the tool or shaft does not rotate exactly in line with the main axis. For example; when drilling, run-out will result in a larger hole than the drill's nominal diameter due to the drill being rotated eccentrically (off axis instead of in line). In the case of bearings, run-out will cause vibration of the machine and increased loads on the bearings.[1]

Run-out is dynamic and cannot be compensated. If a rotating component, such as a drill chuck, does not hold the drill centrally, then as it rotates the rotating drill will turn about a secondary axis.

Run-out has two main forms:[2]

• Radial run-out is caused by the tool or component being rotated off centre, i.e. the tool or component axis does not correspond with the main axis. Radial run-out will measure the same all along the main axis.
• Axial run-out is caused by the tool or component being at an angle to the axis. Axial run-out causes the tip of the tool (or shaft) to rotate off centre relative to the base. Axial run-out will vary according to how far from the base it is measured.

In addition, irregular run-out is the result of worn or rough bearings which can manifest itself as either axial or radial run-out.

Runout will be present in any rotating system and, depending on the system, the different forms may either combine increasing total runout, or cancel reducing total runout. At any point along a tool or shaft it is not possible to determine whether runout is axial or radial; only by measuring along the axis can they be differentiated.

Absolute alignment is impossible; a degree of error will always be present.'